3.14×102＝ 0.125×7.41×80＝ （3.2+0.56）÷0.8＝ 脱式计算，谢谢

Answer 1

3.14×102
＝ 3.14x(100+2)

=3.14x100+3.14x2
=314+6.28
=320.28

0.125×7.41×80
＝ 0.125x80x7.41
=10x7.41
=74.1

（3.2+0.56）÷0.8
＝3.2÷0.8+0.56÷0.8
=4+0.7
=4.7