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12a³-12a²+3ab²
-4mx²+8mx-4m
人气:472 ℃ 时间:2020-03-25 23:09:47
解答
12a³-12a²b+3ab²
=3a(4a²-4ab+b²)
=3a(2a-b)²
-4mx²+8mx-4m
=-4m(x²-2x+1)
=-4m(x-1)²
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