脱式计算（能简算的要简算）0.68×40.5×0.762.4×15-66.95÷65（0.295-0.17）×0.8÷0.112.5×25×0.321.68+11.3+2.7+3.321÷（3.1-3.09）+2.4．

Question

脱式计算（能简算的要简算）

0.68×40.5×0.7	62.4×15-66.95÷65
（0.295-0.17）×0.8÷0.1	12.5×25×0.32
1.68+11.3+2.7+3.32	1÷（3.1-3.09）+2.4．

Answer 1

（1）0.68×40.5×0.7
=27.54×0.7
=19.275

（2）62.4×15-66.95÷65
=936-1.03
=934.97

（3）（0.295-0.17）×0.8÷0.1
=0.125×0.8÷0.1
=0.2÷0.1
=2

（4）12.5×25×0.32
=12.5×0.8×0.4×25
=（12.5×0.8）×（0.4×25）
=10×10
=100

（5）1.68+11.3+2.7+3.32
=（1.68+3.32）+（11.3+2.7）
=5+14
=19

（6）1÷（3.1-3.09）+2.4
=1÷0.01+2.4
=100+2.4
=102.4