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数学
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求这些题的解 -40-28-(-19)+(-24); 化简 (8a-6a)-(4a-5a)+(3a-2b)
人气:394 ℃ 时间:2019-08-20 18:40:07
解答
-40-28-(-19)+(-24)
=-68+19-24
=-69+1+19-24
=-50-23
=-73
(8a-6a)-(4a-5a)+(3a-2b)
=2a-(-a)+3a-2b
=2a+a+3a-2b
=6a-2b
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