Question

脱式计算，能简算的要能简算． 12.5×0.25×3.23.6×0.73+0.73×6.

脱式计算，能简算的要能简算． 12.5×0.25×3.23.6×0.73+0.73×6.42.4÷2.5÷0.458×110+38÷10910-（14+720）÷341.9-1.9×（1.9-1.9）

Answer 1

（1）12.5×0.25×3.2
=（12.5×0.8）×（0.25×4）
=10×1
=10

（2）3.6×0.73+0.73×6.4
=（3.6+6.4）×0.73
=10×0.73
=7.3

（3）2.4÷2.5÷0.4
=2.4÷（2.5×0.4）
=2.4÷1
=2.4

（4）

5

8

×

1

10

+

3

8

÷10
=

5

8

×

1

10

+

3

8

×

1

10

=（

5

8

+

3

8

）×

1

10

=1×

1

10

=

1

10

（5）

9

10

-（

1

4

+

7

20

）÷

3

4

=

9

10

-

3

5

÷

3

4

=

9

10

-

4

5

=

1

10

（6）1.9-1.9×（1.9-1.9）
=1.9-1.9×0
=1.9-0
=1.9