二1.若2x+3y=2008,则代数式2(3x-2y)-(x-y)+9-x+9y)= 三.x^2+3x+k是完全平方式,则k= .一分解因式 1.m^2(a-m)(a-n)+n^2(m-a)(a-n) 2.9(2a+b)^2-25(a-b)^2 3.-3x^n+1+6x^ny-3x^n-1y^2 4.(3x-1)^3-(12x-4) 5.(x^3-4x^2y+4xy^2)-x+2y 6.4m^2-n^2-4m+1
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![二1.若2x+3y=2008,则代数式2(3x-2y)-(x-y)+9-x+9y)= 三.x^2+3x+k是完全平方式,则k= .一分解因式 1.m^2(a-m)(a-n)+n^2(m-a)(a-n) 2.9(2a+b)^2-25(a-b)^2 3.-3x^n+1+6x^ny-3x^n-1y^2 4.(3x-1)^3-(12x-4) 5.(x^3-4x^2y+4xy^2)-x+2y 6.4m^2-n^2-4m+1](/uploads/image/z/1008297-9-7.jpg?t=%E4%BA%8C1.%E8%8B%A52x%2B3y%3D2008%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8F2%EF%BC%883x-2y%29-%28x-y%29%2B9-x%2B9y%29%3D+%E4%B8%89.x%5E2%2B3x%2Bk%E6%98%AF%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%BC%8F%2C%E5%88%99k%3D+.%E4%B8%80%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F+1.m%5E2%28a-m%29%28a-n%29%2Bn%5E2%28m-a%29%28a-n%29+2.9%282a%2Bb%29%5E2-25%28a-b%29%5E2+3.-3x%5En%2B1%2B6x%5Eny-3x%5En-1y%5E2+4.%283x-1%29%5E3-%2812x-4%29+5.%28x%5E3-4x%5E2y%2B4xy%5E2%29-x%2B2y+6.4m%5E2-n%5E2-4m%2B1)
二1.若2x+3y=2008,则代数式2(3x-2y)-(x-y)+9-x+9y)= 三.x^2+3x+k是完全平方式,则k= .一分解因式 1.m^2(a-m)(a-n)+n^2(m-a)(a-n) 2.9(2a+b)^2-25(a-b)^2 3.-3x^n+1+6x^ny-3x^n-1y^2 4.(3x-1)^3-(12x-4) 5.(x^3-4x^2y+4xy^2)-x+2y 6.4m^2-n^2-4m+1
二1.若2x+3y=2008,则代数式2(3x-2y)-(x-y)+9-x+9y)= 三.x^2+3x+k是完全平方式,则k= .
一分解因式 1.m^2(a-m)(a-n)+n^2(m-a)(a-n) 2.9(2a+b)^2-25(a-b)^2 3.-3x^n+1+6x^ny-3x^n-1y^2 4.(3x-1)^3-(12x-4) 5.(x^3-4x^2y+4xy^2)-x+2y 6.4m^2-n^2-4m+1 二.( )÷a=a^3 三.1.若2x+3y=2008,则代数式2(3x-2y)-(x-y)+9-x+9y)= 四.x^2+3x+k是完全平方式,则k=
二1.若2x+3y=2008,则代数式2(3x-2y)-(x-y)+9-x+9y)= 三.x^2+3x+k是完全平方式,则k= .一分解因式 1.m^2(a-m)(a-n)+n^2(m-a)(a-n) 2.9(2a+b)^2-25(a-b)^2 3.-3x^n+1+6x^ny-3x^n-1y^2 4.(3x-1)^3-(12x-4) 5.(x^3-4x^2y+4xy^2)-x+2y 6.4m^2-n^2-4m+1
一分解因式
1.m^2(a-m)(a-n)+n^2(m-a)(a-n)
=(a-m)(a-n)[m^2-n^2]
=(a-m)(a-n)(m+n)(m-n)
2.9(2a+b)^2-25(a-b)^2
=[3(2a+b)+5(a-b)][3(2a+b)-5(a-b)]
=[11a-2b][a+8b]
3.-3x^n+1+6x^ny-3x^n-1y^2
=-6x^n(1-y )+1-y^2
=(1-y)(1+y-6x^n)
4.(3x-1)^3-(12x-4)
=(3x-1)^3-4(3x-1)
=(3x-1)[(3x-1)^2-4]
=3(3x-1)(3x-5)(x+1)
5.(x^3-4x^2y+4xy^2)-x+2y
=x(x^2-4xy+4y^2)-(x-2y)
=(x-2y)[x(x-2y)-1]
=(x-2y)(x^2-2xy-1)
6.4m^2-n^2-4m+1
=(2m-1)^2-n^2
=(2m-1+n)(2m-1-n)
二.
( a^4 )/a=a^3
四.x^2+3x+k是完全平方式,则k=2.25
一分解因式 1.m^2(a-m)(a-n)+n^2(m-a)(a-n) 2.9(2a+b)^2-25(a-b)^2 3.-3x^n+1+6x^ny-3x^n-1y^2 4.(3x-1)^3-(12x-4) ...
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一分解因式 1.m^2(a-m)(a-n)+n^2(m-a)(a-n) 2.9(2a+b)^2-25(a-b)^2 3.-3x^n+1+6x^ny-3x^n-1y^2 4.(3x-1)^3-(12x-4) 5.(x^3-4x^2y+4xy^2)-x+2y 6.4m^2-n^2-4m+1 二.( )÷a=a^3 三.1.若2x+3y=2008,则代数式2(3x-2y)-(x-y)+9-x+9y)= 四.x^2+3x+k是完全平方式,则k=1.m^2(a-m)(a-n)+n^2(m-a)(a-n)
=(a-m)(a-n)[m^2-n^2]
=(a-m)(a-n)(m+n)(m-n)
2.9(2a+b)^2-25(a-b)^2
=[3(2a+b)+5(a-b)][3(2a+b)-5(a-b)]
=[11a-2b][a+8b]
3.-3x^n+1+6x^ny-3x^n-1y^2
=-6x^n(1-y )+1-y^2
=(1-y)(1+y-6x^n)
4.(3x-1)^3-(12x-4)
=(3x-1)^3-4(3x-1)
=(3x-1)[(3x-1)^2-4]
=3(3x-1)(3x-5)(x+1)
5.(x^3-4x^2y+4xy^2)-x+2y
=x(x^2-4xy+4y^2)-(x-2y)
=(x-2y)[x(x-2y)-1]
=(x-2y)(x^2-2xy-1)
6.4m^2-n^2-4m+1
=(2m-1)^2-n^2
=(2m-1+n)(2m-1-n)
二.
( a^4 )/a=a^3
四.x^2+3x+k是完全平方式,则k=2.25
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如此基础的题目自己懒的做就来知道?要答案去抄作业不就行了呗