下列各题怎样简便怎样算.4.5×10.1 13÷0.4÷2.528...

2023-01-12

【题目】下列各题怎样简便怎样算.

4.5×10.1      13÷0.4÷2.5

28.4×99+28.4     0.125×3.2×0.25

【答案】(1)45.45

(2)13

(3)2840

(4)0.1

【解析】

(1)4.5×10.1

=4.5×(10+0.1)

=4.5×10+4.5×0.1

=45+0.45

=45.45

(2)13÷0.4÷2.5

=13÷(0.4×2.5)

=13÷1

=13

(3)28.4×99+28.4

=28.4×(99+1)

=28.4×100

=2840

(4)0.125×3.2×0.25

=0.125×(8×0.4)×0.25

=(0.125×8)×(0.4×0.25)

=1×0.1

=0.1