Question

【题目】计算。(能简算的要简算)

1.25×5×8　　　　　　　　　　　1.42×0.8+1.42×9.2　　　　45-13.4-20.6

4.8÷[12×(19.55-19.54)]　　 6.4÷[(4.3+2.1)÷0.8]　　　 13.8+8.1×3

Answer 1

【答案】50　14.2 11　　40 0.8 38.1

【解析】

1.25×5×8

=1.25×8×5

=10×5

=50

1.42×0.8+1.42×9.2

=1.42×(0.8+9.2)

=1.42×10

=14.2

45-13.4-20.6

=45-(13.4+20.6)

=45-34

=11

4.8÷[12×(19.55-19.54)]

=4.8÷[12×0.01]

=4.8÷0.12

=40

6.4÷[(4.3+2.1)÷0.8]

=6.4÷[6.4÷0.8]

=6.4÷8

=0.8

13.8+8.1×3

=13.8+24.3

=38.1