(1)计算:(﹣4a 2 b 4 c)÷( a 2 b 3 )·2ab 2 (2)计算: (3)先化简,再求值:[(xy+2)(xy
(1)计算:(﹣4a2b4c)÷(a2b3)·2ab2(2)计算:(3)先化简,再求值:[(xy+2)(xy﹣2)﹣2x2y2+4]÷(xy),其中x=10,....
(1)计算:(﹣4a 2 b 4 c)÷( a 2 b 3 )·2ab 2 (2)计算: (3)先化简,再求值:[(xy+2)(xy﹣2)﹣2x 2 y 2 +4]÷(xy),其中x=10, .
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