(1)计算化简(x-2y)(x+y)-(y-2x)^2+(-2y-x)(x-2y) (2)化简-3a(a^2-3分之2ab+2b^2)+a(a+2b)^2,当a=-1b=3分之1

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(1)计算化简(x-2y)(x+y)-(y-2x)^2+(-2y-x)(x-2y) (2)化简-3a(a^2-3分之2ab+2b^2)+a(a+2b)^2,当a=-1b=3分之1
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(1)计算化简(x-2y)(x+y)-(y-2x)^2+(-2y-x)(x-2y) (2)化简-3a(a^2-3分之2ab+2b^2)+a(a+2b)^2,当a=-1b=3分之1
(1)计算化简(x-2y)(x+y)-(y-2x)^2+(-2y-x)(x-2y) (2)化简-3a(a^2-3分之2ab+2b^2)+a(a+2b)^2,当a=-1
b=3分之1

(1)计算化简(x-2y)(x+y)-(y-2x)^2+(-2y-x)(x-2y) (2)化简-3a(a^2-3分之2ab+2b^2)+a(a+2b)^2,当a=-1b=3分之1
原式=x²-xy-2y²-y²+4xy-4x²+4y²-x²
=-4x²+3xy+y²
原式=-3a³+2a²b-6ab²+a³+4a²b+4ab²
=-2a³+6a²b-2ab²
=2+6b+2b²