a(2/25+1/15)+(8-a)2/25=1怎么解
人气:114 ℃ 时间:2020-05-21 08:28:26
解答
a(2/25+1/15)+(8-a)2/25=1
(2/25+1/15)a+(16/25)-(2/25)a=1
(2/25+1/15-2/25)a=1-(16/25)
(1/15)a=9/25
a=(9/25)×15
a=27/5
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