乘法公式练习题
1.(2x+3y)(3x-y)=________
2.(2x-3y)(3x-2y)=_________
3.(4x+6y)(2x-3y)=_____
4.(2x-1)²-(x+2)²=______
5.(2x+____)(____-y)=4x²-y²
6.(1+x)(1-x)(1+x²)(1+x^4)=____
7.(2x+5y-3)(-2x+5y+5)=______
8.(x+y)²(x-y)²=______
9.(a-1/2)²(a²+1/4)²(a+1/2)²=____
10.(a-2b+c)(a+2b-c)-(a+2b+c)²=____
11.化简求值
(2x-1)(x+2)-(x-2)²-(x+2)²,其中x=负的1又二分之一