x/3+y/4=54/60
x/5+y/4=42/60
x/3+y/4=9/10
x/5+y/4=7/10
两式相减得2x/15=1/5
x=1.5
y=1.6
x/3+y/4=54/60 x/5+y/4=42/60
x/3+y/4=54/60 x/5+y/4=42/60
数学人气:640 ℃时间:2020-05-25 12:30:02
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