(2a+b)(2a-b)+b(2a+b)-4a^2b÷b,其中a=-1/2,b=2
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(2a+b)(2a-b)+b(2a+b)-4a^2b÷b,其中a=-1/2,b=2
(2a+b)(2a-b)+b(2a+b)-4a^2b÷b,其中a=-1/2,b=2
(2a+b)(2a-b)+b(2a+b)-4a^2b÷b,其中a=-1/2,b=2
=4a²-b²+2ab+b²-4a²=2ab=-2
-2a(a+b)+b(a+b)
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