计算(3m²一4n²)一(一4n²一3m²)
人气:312 ℃ 时间:2019-10-18 02:42:57
解答
(3m²一4n²)一(一4n²一3m²)
=(3m²一4n²)+(4n²+3m²)
=3m²一4n²+4n²+3m²
=6m²
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