问题 解答题
口算.
(20+4)×25=
2100÷30=108×5=630÷70=
9600÷800=60×30=14×30=7×48+7×52=
答案

(20+4)×25=600,2100÷30=70,108×5=540,630÷70=9,
9600÷800=12,60×30=1800,14×30=420,7×48+7×52=700,
故答案为:600,70,540,9,12,1800,420,700.

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