作业帮(x-2)(x+2)-(x-2)(x+2)-(x-1)(x+3)-(x+2)还有（2x+3y-2)(2x-3y+2)还有已知xy²=-2 求xy（2x³y^7-5x²y^5-y） 坐等我搞错了(x-2)(x+2)-(x-1)(x+3)-(x+2)²
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(x-2)(x+2)-(x-2)(x+2)-(x-1)(x+3)-(x+2)还有（2x+3y-2)(2x-3y+2)还有已知xy²=-2 求xy（2x³y^7-5x²y^5-y） 坐等我搞错了(x-2)(x+2)-(x-1)(x+3)-(x+2)²
(x-2)(x+2)-(x-2)(x+2)-(x-1)(x+3)-(x+2)还有（2x+3y-2)(2x-3y+2)
还有已知xy²=-2 求xy（2x³y^7-5x²y^5-y）
坐等
我搞错了(x-2)(x+2)-(x-1)(x+3)-(x+2)²
(x-2)(x+2)-(x-2)(x+2)-(x-1)(x+3)-(x+2)还有（2x+3y-2)(2x-3y+2)还有已知xy²=-2 求xy（2x³y^7-5x²y^5-y） 坐等我搞错了(x-2)(x+2)-(x-1)(x+3)-(x+2)²
(x-2)(x+2)-(x-2)(x+2)-(x-1)(x+3)-(x+2)
=-(x-1)(x+3)-(x+2)
=-x²-2x+3-x-2
=-x²-3x+1
(2x+3y-2)(2x-3y+2)
=[2x+(3y-2)][2x-(3y-2)]
=4x²-(3y-2)²
=4x²-9y²+12y-4
xy（2x³y^7-5x²y^5-y）
=2x^4y^8-5x³y^6-xy²
=2(xy²)^4-5(xy²)³-xy²
=32+40+2
=74
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