Question

这四道题目的简便运算怎么做

Answer 1

12.5×0.25×3.2
=12.5×0.25×(8×0.4)
=(12.5×8)×(0.25×0.4)
=100×0.1
=10

追答

0.45÷0.3
=1.5

0.67×99
=0.67×(100-1)
=0.67×100-0.67
=67-0.67
=66.33

5.52-(3.52+1.49)
=(5.52-3.52)+1.49
=2+1.49
=3.49

对不起最后那个算错了

5.52-(3.52+1.49)
=(5.52-3.52)-1.49
=2-1.49
=0.51

Answer 2

12.5x0.25x3.2
=12.5x0.25x0.8x4
=(12.5x0.8)x(0.25x4)
=10x1
=1

追答

写错了=10

0.67x99
=0.67x(100-1)
=0.67x100-0.67xl
=67-0.67
=66.33

5.52-(3.52十l.49)
=5.52-3.52-l.49
=2-1.49
=0.51

Answer 3

0.67*99=0.67*(100-1)=0.67*100-0.67=67-0.67=66.33

Answer 4

追答