Question

计算下面各题．能简便的用简便方法计算4.05÷0.5+10.7521.6÷0.8-1.2×56.8×2.7+2.7×3.28.4×6.9÷（6.

计算下面各题．能简便的用简便方法计算4.05÷0.5+10.7521.6÷0.8-1.2×56.8×2.7+2.7×3.28.4×6.9÷（6.44-4.14）0.38×102 4.8÷2.5÷4．

Answer 1

（1）4.05÷0.5+10.75
=8.1+10.75
=18.85

（2）21.6÷0.8-1.2×5
=27-6
=21

（3）6.8×2.7+2.7×3.2
=（6.8+3.2）×2.7
=10×2.7
=27

（4）8.4×6.9÷（6.44-4.14）
=8.4×6.9÷2.3
=8.4×（6.9÷2.3）
=8.4×3
=25.2

（5）0.38×102 
=0.38×（100+2）
=0.38×100+0.38×2 
=38+0.76
=38.76

（6）4.8÷2.5÷4
=4.8÷（2.5×4）
=4.8÷10
=0.48