Question

整式的乘法题目

4x²y·（-xy²）³+6x²·3x³y^7=_____
[2ab²·（-3ab）]²=_____
（-2x²y³）²·（-3xy²）=_____
x^m·(x^(n-1)-x^m-1)=_____
3x(x²-2x-1)-x²（x-2)=_____
(x-3)(x-3)-6(x²+x-1)=_____
(m-n)²-m²-n²=_____

Answer 1

• 1.原式=-4x^5 y^7 +18x^5 y^7

• 2.原式=-36a^4·b^6

• 3.原式=-12x^5y^8

• 4.原式=x^(m+n-1)-x^2m-x^m

• 5. 原式=3x³-6x²-3x-x³+2x²
  =2x³-4x-3x

• 6.原式=(x-3)²-6x²-6x+6

  =x²-6x+9-6x²-6x+6

  =-5x²-12x+15

• 7.原式=m²-2mn+n²-m²-n²

  =-2mn