a+2b=0 , 求a^3+3a^2 × b+2ab^2的值
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a+2b=0 , 求a^3+3a^2 × b+2ab^2的值
a+2b=0 , 求a^3+3a^2 × b+2ab^2的值
a+2b=0 , 求a^3+3a^2 × b+2ab^2的值
a^3+3a^2 × b+2ab^2
=a(a²+3ab+2b²)
=a(a+2b)(a+b)
=0
a+2b=0 , 求a^3+3a^2 × b+2ab^2的值
a+2b=0 , 求a^3+3a^2 × b+2ab^2的值
a+2b=0 , 求a^3+3a^2 × b+2ab^2的值
a^3+3a^2 × b+2ab^2
=a(a²+3ab+2b²)
=a(a+2b)(a+b)
=0