(6x*2y-4xy*2)除以2xy的问题

重卡之家 2023-08-21 20:08 编辑:admin 247阅读

一、(6x*2y-4xy*2)除以2xy的问题

3x-2y

0.75y

是(四分之七x)(8x^2-4)=14x^3-7x吗?

1   -0.6

3   2

-8070

二、1.-0.1xy^2 × 10x/y^2=

1.-0.1xy^2 × 10x/y^2=-x^2

2.-5ab÷5b^2/3a=3a^2/b

3.(-y/3x)^2 × (-(2x^2 / y))^3=y^2/9x^2*-8x^6/y^3=-8x^4/9y

4.a/xy-b/xy=(a-b)/xy

5.a-b/x - a+b/x=0

6.5a/2a-b  -  5a/b-2a=10a/(2a-b)

7.m^2/m+n - n^2/m+n=m-n

8.分式3/2(x+1) , 2x-1/5(x-1) ,1-2x/n-m的最简公分母是:10(x+1)(x-1)(n-m)

9.m+2n/nm + n/m-n - 2m/n-m=(m+2n)/mn+n/(m-n)+2m/(m-n)=[(2n+m)(m-n)+(n+2m)mn]/mn

=[(2n+m)(m-n+mn]/mn

10.(a+b)/(a^2+ab )× (a^2 b^2-a^4)/(ab-a^2)=(a+b)/a(a+b)*a^2(b-a)(b+a)/a(b-a)=a+b

11.x/(x^2y-y)÷x^2/(x^2y-xy)=x/(x^2-1)y*xy(x-1)/x^2=1/(x+1)

12.2x-6/x-2÷x-3/x^2-4=2(x-3)/(x-2)*(x-2)(x+2)/(x-3)=2(x+2)=2x+4

13.(x-y)/(x+y)÷(x-y)×1/(x-y)=1/(x+y)(x-y)

三、2x^4+5x^3-35x^2-80x+48因式分解

2x^4+5x^3-35x^2-80x+48

设x^2=y

原式=2y^2+(5x-35)y-80x+48

=(y-16)(2y+5x-3)

=(x^2-16)(2x^2+5x-3)

=(x-4)(x+4)(x+3)(2x-1)

四、因式分解的公式是什么

x³-2x²+x

解:原式=x(x²-2x+1)

=x(x-1)²

(1-a²)(1-b²)-4ab

解:原式=1-a²-b²+a²b²-4ab

=(1-ab)²-(a+b)²

=(1-ab+a+b)(1-ab-a-b)

(x²+5x+9)(x²-3x+7)-3(4x+1)²

解:设t=[(x²+5x+9)+(x²-3x+7)]/2=x²+x+8

则原式=[t+(4x+1)][t-(4x+1)]-3(4x+1)²

=t²-(4x+1)²-3(4x+1)²

=t²-4(4x²+1)²

=t²-[2(4x+1)]²

=t²-(8x+2)²

=(t+8x+2)(t-8x-2)

=(x²+9x+10)(x²-7x+6)

=(x²+9x+10)(x-1)(x-6)

2α+3α²+2α³-32

解:原式=2α³+3α²-14α+16α-32

=α(2α²+3α-14) +16(α-2)

=α(α-2)(2α+7)+16(α-2)

=(α-2)(2α²+7α+16)

2acx+4bcx+adx+2bdx+4acy+8bcy+2abdy+4bdy

解:原式=(2acx+4bcx+adx+2bdx)+(4acy+8bcy+2ady+4+bdy)

=x(2ac+4bc+ad+2bd)+2y(2ac+4bc+ad+2bd)

=(2ac+4bc+ad+2bd)(x+2y)

=[2c(a+2b)+d(a+2b)](x+2y)

=(a+2b)(2c+d)(x+2y)

五、(2x-y+3z)的平方等于多少 要过程 初二

(2x-y+3z)的平方

=(2x)^2+(-y)^2+(3z)^2+2*2x(-y)+2*2x*(3z)+2*(-y)*3z

=4x^2+y^2+9z^2-4xy+12xz-6yz

六、初一数学整式计算题

(一)填空 3.3ab-4ab+8ab-7ab+ab=______. 4.7x-(5x-5y)-y=______. 5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______. 6.-7x2+6x+13x2-4x-5x2=______. 7.2y+(-2y+5)-(3y+2)=______. 11.(2x2-3xy+4y2)+(x2+2xy-3y2)=______. 12.2a-(3a-2b+2)+(3a-4b-1)=______. 13.-6x2-7x2+15x2-2x2=______. 14.2x-(x+3y)-(-x-y)-(x-y)=______. 16.2x+2y-[3x-2(x-y)]=______. 17.5-(1-x)-1-(x-1)=______. 18.( )+(4xy+7x2-y2)=10x2-xy. 19.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3. 21.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______. 22.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______. 23.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______. 25.一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______. 26.-(2x2-y2)-[2y2-(x2+2xy)]=______. 27.若-3a3b2与5ax-1by+2是同类项,则x=______,y=______. 28.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______. 29.化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______. 30.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ). 31.3a-(2a-3b)+3(a-2b)-b=______. 32.化简代数式x-[y-2x-(x+y)]等于______. 33.[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1. 34.3x-[y-(2x+y)]=______. 35.化简|1-x+y|-|x-y|(其中x<0,y>0)等于______. 36.已知x≤y,x+y-|x-y|=______. 37.已知x<0,y<0,化简|x+y|-|5-x-y|=______. 38.4a2n-an-(3an-2a2n)=______. 39.若一个多项式加上-3x2y+2x2-3xy-4得 2x2y+3xy2-x2+2xy, 则这个多项式为______. 40.-5xm-xm-(-7xm)+(-3xm)=______. 41.当a=-1,b=-2时, [a-(b-c)]-[-b-(-c-a)]=______. 43.当a=-1,b=1,c=-1时, -[b-2(-5a)]-(-3b+5c)=______. 44.-2(3x+z)-(-6x)+(-5y+3z)=______. 45.-5an-an+1-(-7an+1)+(-3an)=______. 46.3a-(2a-4b-6c)+3(-2c+2b)=______. 48.9a2+[7a2-2a-(-a2+3a)]=______. 50.当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______. (二)选择 [ ] A.2; B.-2; C.-10; D.-6. 52.下列各式中计算结果为-7x-5x2+6x3的是 [ ] A.3x-(5x2+6x3-10x); B.3x-(5x2+6x3+10x); C.3x-(5x2-6x3+10x); D.3x-(5x2-6x3-10x). 53.把(-x-y)+3(x+y)-5(x+y)合并同类项得 [ ] A.(x-y)-2(x+y); B.-3(x+y); C.(-x-y)-2(x+y); D.3(x+y). 54.2a-[3b-5a-(2a-7b)]等于 [ ] A.-7a+10b; B.5a+4b; C.-a-4b; D.9a-10b. 55.减去-3m等于5m2-3m-5的代数式是 [ ] A.5(m2-1); B.5m2-6m-5; C.5(m2+1); D.-(5m2+6m-5). 56.将多项式2ab-9a2-5ab-4a2中的同类项分别结合在一起,应为 [ ] A.(9a2-4a2)+(-2ab-5ab); B.(9a2+4a2)-(2ab-5ab); C.(9a2-4a2)-(2ab+5ab); D.(9a2-4a2)+(2ab-5ab). 57.当a=2,b=1时,-a2b+3ba2-(-2a2b)等于 [ ] A.20; B.24; C.0; D.16. 中,正确的选择是 [ ] A.没有同类项; B.(2)与(4)是同类项; C.(2)与(5)是同类项; D.(2)与(4)不是同类项. 59.若A和B均为五次多项式,则A-B一定是 [ ] A.十次多项式; B.零次多项式; C.次数不高于五次的多项式; D.次数低于五次的多项式. 60.-{[-(x+y)]}+{-[(x+y)]}等于 [ ] A.0; B.-2y; C.x+y; D.-2x-2y. 61.若A=3x2-5x+2,B=3x2-5x+6,则A与B的大小是 [ ] A.A>B; B.A=B; C.A<B; D.无法确定. 62.当m=-1时,-2m2-[-4m2+(-m2)]等于 [ ] A.-7; B.3; C.1; D.2. 63.当m=2,n=1时,多项式-m-[-(2m-3n)]+[-(-3m)-4n]等于 [ ] A.1; B.9; C.3; D.5. [ ] 65.-5an-an-(-7an)+(-3an)等于 [ ] A.-16an; B.-16; C.-2an; D.-2. 66.(5a-3b)-3(a2-2b)等于 [ ] A.3a2+5a+3b; B.2a2+3b; C.2a3-b2; D.-3a2+5a-5b. 67.x3-5x2-4x+9等于 [ ] A.(x3-5x2)-(-4x+9); B.x3-5x2-(4x+9); C.-(-x3+5x2)-(4x-9); D.x3+9-(5x2-4x). [ ] 69.4x2y-5xy2的结果应为 [ ] A.-x2y; B.-1; C.-x2y2; D.以上答案都不对. (三)化简 70.(4x2-8x+5)-(x3+3x2-6x+2). 72.(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2). 73.-{2a2b-[3abc-(4ab2-a2b)]}. 74.(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b). 75.(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2). 76.(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4). 77.(4a-2b-c)-5a-[8b-2c-(a+b)]. 78.(2m-3n)-(3m-2n)+(5n+m). 79.(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab). 80.xy-(2xy-3z)+(3xy-4z). 81.(-3x3+2x2-5x+1)-(5-6x-x2+x3). 83.3x-(2x-4y-6x)+3(-2z+2y). 84.(-x2+4+3x4-x3)-(x2+2x-x4-5). 85.若A=5a2-2ab+3b2,B=-2b2+3ab-a2,计算A+B. 86.已知A=3a2-5a-12,B=2a2+3a-4,求2(A-B). 87.2m-{-3n+[-4m-(3m-n)]}. 88.5m2n+(-2m2n)+2mn2-(+m2n). 89.4(x-y+z)-2(x+y-z)-3(-x-y-z). 90.2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2). 92.2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2). 94.4x-2(x-3)-3[x-3(4-2x)+8]. (四)将下列各式先化简,再求值 97.已知a+b=2,a-b=-1,求3(a+b)2(a-b)2-5(a+b)2×(a-b)2的值. 98.已知A=a2+2b2-3c2,B=-b2-2c2+3a2,C=c2+2a2-3b2,求(A-B)+C. 99.求(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2. 101.已知|x+1|+(y-2)2=0,求代数式5(2x-y)-3(x-4y)的值. 106.当P=a2+2ab+b2,Q=a2-2ab-b2时,求P-[Q-2P-(P-Q)]. 107.求2x2-{-3x+5+[4x2-(3x2-x-1)]}的值,其中x=-3. 110.当x=-2,y=-1,z=3时,求5xyz-{2x2y-[3xyz-(4xy2-x2y)]}的值. 113.已知A=x3-5x2,B=x2-6x+3,求A-3(-2B). (五)综合练习 115.去括号:{-[-(a+b)]}-{-[-(a-b)]}. 116.去括号:-[-(-x)-y]-[+(-y)-(+x)]. 117.已知A=x3+6x-9,B=-x3-2x2+4x-6,计算2A-3B,并把结果放在前面带“-”号的括号内. 118.计算下式,并把结果放在前面带“-”号的括号内: (-7y2)+(-4y)-(-y2)-(+5y)+(-8y2)+(+3y). 119.去括号、合并同类项,将结果按x的升幂排列,并把后三项放在带有“-”号的括号内: 120.不改变下式的值,将其中各括号前的符号都变成相反的符号:(x3+3x2)-(3x2y-7xy)+(2y3-3y2). 121.把多项式4x2y-2xy2+4xy+6-x2y2+x3-y2的三次项放在前面带有“-”号的括号内,二次项放在前面带有“+”号的括号内,四次项和常数项放在前面带有“-”号的括号内. 122.把下列多项式的括号去掉,合并同类项,并将其各项放在前面带有“-”号的括号内,再求2x-2[3x-(5x2-2x+1)]-4x2的值,其中x=-1. 123.合并同类项: 7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y. 124.合并同类项:5m2n+5mn2-mn+3m2n-6mn2-8mn. 126.去括号,合并同类项: (1)(m+1)-(-n+m); (2)4m-[5m-(2m-1)]. 127.化简:2x2-{-3x-[4x2-(3x2-x)+(x-x2)]}. 128.化简:-(7x-y-2z)-{[4x-(x-y-z)-3x+z]-x}. 129.计算:(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a). 130.化简:a3-(a2-a)+(a2-a+1)-(1-a4+a3). 131.将x2-8x+2x3-13x2-2x-2x3+3先合并同类项,再求值,其中x=-4. 132.在括号内填上适当的项:[( )-9y+( )]+2y2+3y-4=11y2-( )+13. 133.在括号内填上适当的项: (-x+y+z)(x+y-z)=[y-( )][y+( )]. 134.在括号内填上适当的项: (3x2+xy-7y2)-( )=y2-2xy-x2. 135.在括号内填上适当的项: (1)x2-xy+y-1=x2-( ); (2)[( )+6x-7]-[4x2+( )-( )]=x2-2x+1. 136.计算4x2-3[x+4(1-x)-x2]-2(4x2-1)的值. 137.化简: 138.用竖式计算 (-x+5+2x4-6x3)-(3x4+2x2-3x3-7). 139.已知A=11x3+8x2-6x+2,B=7x3-x2+x+3,求2(3A-2B). 140.已知A=x3-5x2,B=x3-11x+6,C=4x-3,求 (1)A-B-C; (2)(A-B-C)-(A-B+C). 141.已知A=3x2-4x3,B=x3-5x2+2,计算 (1)A+B; (2)B-A. 142.已知x<-4,化简|-x|+|x+4|-|x-4|. 146.求两代数式-1.56a+3.2a3-0.47,2.27a3-0.02a2+4.03a+0.53的差与6-0.15a+3.24a2+5.07a3的和. -0.3,y=-0.2. 150.已知(x-3)2+|y+1|+z2=0,求x2-2xy-5x2+12xz+3xy-z2-8xz-2x2的值

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