0.67*10.1-6.7的简便计算 2.5*4.4*9的简便计算 2.99*5.2的简便计算 1.02*3.4的简便计算
问题描述：
0.67*10.1-6.7的简便计算 2.5*4.4*9的简便计算 2.99*5.2的简便计算 1.02*3.4的简便计算
答
0.67*10.1-6.7 =6.7*1.01 -6.7 =6.7* (1.01-1) =6.7*0.01 =0067 2.5*4.4*9 =2.5*4*1.1*9 =1.1*9 =9.9 2.99*5.2 =(3-0.01)*5.2 =15.6-0.052 =15.548 1.02*3.4 =(1+0.02) *3.4 =3.4+0.068 =3.468