直接写出得数．
390+11= 620﹣180= 23×4= 560×0=
202×40= 320×3= 8000÷400= 3200÷800=
72万+78万= 38亿+52亿= 480÷56= 40×822=
直接写出得数．
390+11= 620﹣180= 23×4= 560×0=
202×40= 320×3= 8000÷400= 3200÷800=
72万+78万= 38亿+52亿= 480÷56= 40×822=
，那么乙数就比甲数少几分之几？
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÷7=
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= 6÷
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