9x-120=5(x-8)
9x-120=5x-40
9x-5x=-40+120
4x=80
x=20
9x-120=5(x-8)解方程,
9x-120=5(x-8)解方程,
9x-5x=-40+120这一步那下一步的得数应该是160,怎么会是80呢?
9x-5x=-40+120这一步那下一步的得数应该是160,怎么会是80呢?
数学人气:880 ℃时间:2020-04-29 09:16:43
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