计算 1.(-2x)^3-3x乘(x-2x^2) 2.【(x+2y)^2-(x-2y)(x+2y)】÷4y
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计算 1.(-2x)^3-3x乘(x-2x^2) 2.【(x+2y)^2-(x-2y)(x+2y)】÷4y
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越快越好
(1)
(-2x)^3-3x乘(x-2x^2)
=-8x³-3x²+6x³
=-2x³-3x²
=-x²(2x+3)
(2)
[(x+2y)^2-(x-2y)(x+2y)]÷4y
=(x²+2xy+4y²-x²+4y²)/4y
=(2xy+8y²)/4y
=(x+4y)/2
(-2x)^3-3x乘(x-2x^2)
=-8x³-3x²+6x³
=-2x³-3x²
=-x²(2x+3)
(2)
[(x+2y)^2-(x-2y)(x+2y)]÷4y
=(x²+2xy+4y²-x²+4y²)/4y
=(2xy+8y²)/4y
=(x+4y)/2
计算 1.(-2x)^3-3x乘(x-2x^2) 2.【(x+2y)^2-(x-2y)(x+2y)】÷4y
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