问题 解答题

脱式计算(能简算的要简算)

17.64÷4.9+6.73

3.4÷[(1.2+0.5)×5]

9.9+19.9+999.9+0.3

0.25×12.5×32.

答案

①17.64÷4.9+6.73

=3.6+6.73

=10.33

②3.4÷[(1.2+0.5)×5]

=3.4÷(6+2.5)

=3.4÷8.5

=0.4

③9.9+19.9+999.9+0.3

=(9.9+0.1)+(19.9+0.1)+(999.9+0.1)

=10+20+1000

=1030

④0.25×12.5×32

=(0.25×4)×(12.5×8)

=1×100

=100

单项选择题
问答题 简答题