Question

l列竖式计算1.25乘8.88 9.8乘4.7+9.8+6.3乘9.8 （0.69乘99+0.69）除0.23 7.64

Answer 1

1.25乘8.88

=1.25*8*1.11

=10*1.11

=11.1

9.8乘4.7+9.8+6.3乘9.8

=9.8*（4.7+1+6.3）

=9.8*12

=（10-0.2）*12

=10*12-0.2*12

=120-2.4

=117.6

（0.69乘99+0.69）除以0.23

=0.69*（99+1）/0.23

=0.69*100/0.23

=69/0.23

=300

7.64-（6.9-0.6乘0.6）

=7.64+0.36-6.9

=8-6.9

=1.1