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用7、8、9的乘法口诀求商,根据乘法写出两个除法：,8,8,3721,875 6,7535,584,59 4 5,7642,8 9 7 2,8432,6 9 5 4,看算式说出两个除法算式,看口诀说出两个除法算式,三九二十七,三七二十一,四八三十二,四九三十六,五九四十五,二九十八,二七十四,三八二十四,六七四十二,吹泡泡,648,213,328,455,728,186,549,369,284,99,142,497,7,8,4,9,7,1,7,7,4,3,6,9,小兔子过河,162,7,729,637,546,142,819,324,639,213,355,486,567,426,273,455,18 2 =,18 9 =,45 5 =,81 9 =,72 8 =,36 4 =,27 9 =,45 9 =,54 6 =,63 7 =,63 9 =,9 9 =,填一填,