甲乙两辆汽车同时从相距630千米的两地相对开出，经过4.2小时两车相遇．已知甲车每小时行70千米，乙车每小时行多少千米？
直接写得数 4÷= 0×=÷=×1.4=×= 0÷=×10= 30×0.05=
直接写出得数．========
口算． 4.2÷=×3=÷5=（+）×72=×12=×1.8=÷=
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直接写出得出． 20×=÷=×=+=÷6=×12=+= 6÷=﹣=×=×= 0÷=
= 0×
=
÷
×1.4=
×
=
×10= 30×0.05=
=
=
=
=
=
=
=
=
=
×3=
÷5=（
+
）×72=
×12=
÷
=
=
=
=
=
=
=
=
=
÷
=
×
=
+
=
÷6=
+
= 6÷
=
﹣
=
×
=
×
= 0÷
=
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