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计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
人气:241 ℃ 时间:2019-08-18 16:53:46
解答
(1) (2x-3y)+(5x+4y)
=2x+5x-3y+4y
=7x+y

(2) (8a-7b)-(4a-5b)
= 8a-4a-7b+5b
=4a-2b
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