5/1X+4/1X+3/1X+3900=X
60/12X+60/15X+60/20X+3900=X
60/47X+3900=X
X-60/47X=3900
60/13X=3900
X=3900÷60/13
X=18000
/("/"的意识是几分之几)
5/1X+4/1X+3/1X+3900=X
1个回答
相关问题
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