Question

简便运算：(4.9+4.9+4.9+4.9)*7.5 3.85*1.3+1.5*0.13

Answer 1

(4.9+4.9+4.9+4.9)*7.5

=4.9*4*2.5*3

=4.9*3*（4*2.5）

=14.7*10

=147

3.85*1.3+1.5*0.13

=3.85*1.3+0.15*1.3

=（3.85+0.15）*1.3

=4*1.3

=5.2