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-y²6.(1+x)(1-x)(1+x²)(1+x^4)=____7.(2x+5y-3)(-2x+5y+5)=______8.(x+y)²(x-y)²=

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