一辆公共汽车和一辆小轿车同时从相距450千米的辆两地相向而行，公共汽车每小时40千米，小轿车每小时行50千米，问几小时后两车相距90千米？
直接写得数．÷13=×9=÷=﹣×0=+= 6÷=﹣=×=×= 0÷=+16=÷=
直接写出得数． 50%+6=×= 4÷0.5= 28×25%= 95%+5=+= 6.9÷23= 100×0.4=
直接写出得数====+=== 1÷===
直接写出得数．×16= 10÷= 12÷=×=×=÷3=×=×=
6×=+=×= 3﹣=÷= 1÷=÷=﹣=×14=÷12=
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