4辆大卡车运沙土，7趟共运走沙土336吨．现有沙土420吨，增加了3辆相同的卡车，问：几趟可以运完？
直接写得数．=======（﹣）×30=
直接写出得数． 14×=×5=×= 12×= 3×= 7×= 4.8+0.82= 3﹣2.7=（+2）×9=（﹣）×2=
口算题．×=×=×9=××0=+=×11= 5﹣﹣=×9×7=
口算×15=×2=×=×=×= 1×=×=×34=×=×=×=×=×=×=×=×24=×=×30= 28×=×=
直接写出得数×15=×2=×=×= 1×=×=×34=×=×=×=×=×=
=
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=（
﹣
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×5=
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= 12×
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= 4.8+0.82= 3
﹣2.7=（
+2）×9=（
﹣
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×
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×9=
×
×0=
+
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×11= 5﹣
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×9×7=
×15=
×2=
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×
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×34=
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×
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×24=
×
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×30= 28×
=
×
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×15=
×2=
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×
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×
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×34=
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