计算(1) (x+y)(-x-y)(x+y)² (2) (-1/3x²y³)³(3) 若x²+3x-2=0,求2x³+6x²-4x+2的值
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计算(1)(x+y)(-x-y)(x+y)²(2)(-1/3x²y³)³(3)若x²+3x-2=0,求2x³+6x²-4x+2的值
计算(1) (x+y)(-x-y)(x+y)² (2) (-1/3x²y³)³(3) 若x²+3x-2=0,求2x³+6x²-4x+2的值
计算(1) (x+y)(-x-y)(x+y)² (2) (-1/3x²y³)³
(3) 若x²+3x-2=0,求2x³+6x²-4x+2的值
计算(1) (x+y)(-x-y)(x+y)² (2) (-1/3x²y³)³(3) 若x²+3x-2=0,求2x³+6x²-4x+2的值
(1) (x+y)(-x-y)(x+y)²
=-(x+y)(x+y)(x+y)²
=-(x+y)的4次方
(2) (-1/3x²y³)³
=-1/27x的6次方y的9次方
(3) 若x²+3x-2=0
x²+3x=2
2x³+6x²-4x+2
=2x(x²+3x)-4x+2
=2x*2-4x+2
=2
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