Question

这两道题怎样简便计算？

Answer 1

 

Answer 2

l、1.2*9.7+1.2*0.3
=1.2乘(9.7加0.3)
=1.2乘10
=12

追答

2、101乘0.55
=100乘0.55加0.55
=55加0.55
=55.55

Answer 3

=1.2×(0.3+9.7)
=1.2×10
=12

追答

=100×0.55+0.55
=55.55

Answer 4

＝1·2x（9·7＋0·3）＝1·2x10＝12

追答

＝100x0·55＋1x0·55＝55＋0·55＝5·55

Answer 5

 

追答

第一道用乘法分配律，第二道把101分解成100和1