小明在360米长的环行的跑道上跑了一圈，已知他前一半时间每秒跑5米，后一半时间每秒跑4米，问他后一半路程用了多少时间？
直接写得数．+= 1﹣=+=﹣= 1﹣28%=×16=×= 36÷=÷= 25×40%=
直接写出得数． 40×0.25= 1.25×0.8= 0.1÷0.01= 0.6+1.9= 3.5﹣2.25= 12.8÷4=+=﹣= 12×= 1÷=×=÷=
直接写出得数 1﹣0.375= 0.125×8= 280﹣45= 1.3÷0.25= 400÷600= 8.64×100=+=﹣=×=÷= 12×= 6÷=
直接写出得数 0.5×400= 568﹣198=÷= 1÷﹣÷1=×12= 1.7+3.03= 13.5﹣5= 10﹣﹣=
24×0.5=+= 6﹣6÷6= 20×20%= 0.33= 7.2÷0.08= 4÷= 12.5×6.4=﹣= 121×=
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= 6﹣6÷6= 20×20%=
= 12.5×6.4=
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= 121×
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