计算 (-2ab) (3a²-2ab-4b²) (x-y-3)(x+y+3)

问题描述:

计算 (-2ab) (3a²-2ab-4b²) (x-y-3)(x+y+3)
计算
(-2ab) (3a²-2ab-4b²)
(x-y-3)(x+y+3)
因式分解
-2a²+0.5
已知x+y=3,xy=1,求x³y²+x²y³

(-2ab) (3a²-2ab-4b²)
=-6a^3b+4a^2b^2+8ab^3
(x-y-3)(x+y+3)
=x^2-(y+3)^2
=x^2-y^2-6y-9
-2a²+0.5
=1/2*(1-4a^2)
=1/2*(1+2a)(1-2a)
已知x+y=3,xy=1,求x³y²+x²y³
x³y²+x²y³=x^2y^2(x+y)
=(1^2)*3
=3
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