10+5y=5x
4x=2y+4y
x=1.5y
y=4m x=6m
甲.乙两人练习跑步,如果甲让乙先跑10m,甲跑5s就可追上乙;如果让乙先跑2s那么甲跑4s就能追上乙,
甲.乙两人练习跑步,如果甲让乙先跑10m,甲跑5s就可追上乙;如果让乙先跑2s那么甲跑4s就能追上乙,
数学人气:225 ℃时间:2019-10-19 01:32:53
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