(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.
(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.