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数学
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化简-(-2a-b)-(3a-2b)
-(-2a-b)-(3a-2b)=________
人气:113 ℃ 时间:2020-03-18 17:25:24
解答
-(-2a-b)-(3a-2b)
=(2a+b)-(3a-2b)
=2a+b-3a+2b
=2a-3a+2b+b
=-a+3b
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