Question

【题目】计算,能简算的要简算。

4.7+9.69-5.46 　　89.6-5.22-4.78 　　　　　4.5-1.6+5.5-8.4

3.25-(0.86+0.25) 　　19.5-4.85-6.15 　　　　　1.31+4.6+0.69+3.4

Answer 1

【答案】8.93 79.6 0 2.14 8.5 10

【解析】

4.7+9.69-5.46

=4.7+4.23

=8.93

89.6-5.22-4.78

=89.6-(5.22+4.78)

=89.6-10

=79.6

4.5-1.6+5.5-8.4

=(4.5+5.5)-(1.6+8.4)

=10-10

=0

3.25-(0.86+0.25)

=3.25-0.86-0.25

=3.25-0.25-0.86

=3-0.86

=2.14

19.5-4.85-6.15

=19.5-(4.85+6.15)

=19.5-11

=8.5

1.31+4.6+0.69+3.4

=(1.31+0.69)+(4.6+3.4)

=2+8

=10