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s+500=30×v(2)(1)-(2)×2,得s=100米代入,得v=20米/秒6、(290+250+900)÷(20+25)=3.2秒7、s+82=22×v(1)s+162=16×2×v(2)(2)-(1),求得v=8米/秒代入v,求得s=94米8、638=(45-16)×v求得v=22米/秒s=16×22=352米选B9、队伍长队s=(692÷4-...