问题
解答题
用简便方法计算．
0.65×101-0.65
8.16÷0.125÷80
4.3×1.73+1.28×4.3．
答案
①0.65×101-0.65
=0.65×（101-1）
=0.65×100
=65
②8.16÷0.125÷80
=8.16÷（0.125×80）
=8.16÷10
=0.816
③4.3×1.73+1.28×4.3
=4.3×（1.73+1.28）
=4.3×3.01
=4.3×（3+0.01）
=12.9+0.043
=12.943