{x/60+y/80=10,x/60+y/40=15、{2x/3+3y/4=1/5,5x/6-5y/2=2、{5/2(x
4个回答
x/60+y/80=10,(1)
x/60+y/40=15(2)
(2)-(1) y/80=5 y=400
x/60+400/40=15
x=300
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