Question

计算下面各题，能简便计算的要简便计算．5.27-1.98-0.02 3.2×5.7+6.8×...

计算下面各题，能简便计算的要简便计算．5.27-1.98-0.02 3.2×5.7+6.8×5.7 2.5×6.8×0.4 5.6-36÷30 0.72+9.6÷3.2　 7.75×[20÷（3.24-3.04）]．

Answer 1

①5.27-1.98-0.02   
=5.27-（1.98+0.02）
=5.27-2
=3.27；
     
②3.2×5.7+6.8×5.7
=（3.2+6.8）×5.7
=10×5.7
=57；

③2.5×6.8×0.4
=（2.5×0.4）×6.8
=1×6.8
=6.8；

④5.6-36÷30
=5.6-1.2
=4.4；

⑤0.72+9.6÷3.2
=0.72+3
=3.72；

⑥7.75×[20÷（3.24-3.04）]
=7.75×[20÷0.2]
=7.75×100
=775．