(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](/uploads/image/z/6083116-52-6.jpg?t=%281%29%E8%AE%A1%E7%AE%97%E5%8C%96%E7%AE%80%EF%BC%88x-2y%29%28x%2By%29-%28y-2x%29%5E2%2B%28-2y-x%29%28x-2y%29+%282%29%E5%8C%96%E7%AE%80-3a%28a%5E2-3%E5%88%86%E4%B9%8B2ab%2B2b%5E2%29%2Ba%28a%2B2b%29%5E2%2C%E5%BD%93a%3D-1b%3D3%E5%88%86%E4%B9%8B1)
(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
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