a²+b²=0 求(a+b)(3a+2b)-b(5a-b)
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a²+b²=0 求(a+b)(3a+2b)-b(5a-b)
a²+b²=0 求(a+b)(3a+2b)-b(5a-b)
a²+b²=0 求(a+b)(3a+2b)-b(5a-b)
(a+b)(3a+2b)-b(5a-b)
=3a²+2ab+3ab+2b²-5ab+b²
=3a²+3b²
因为 a²+b²=0 则3a²+3b²=0
所以(a+b)(3a+2b)-b(5a-b)=0