脱式计算: 0.75×18÷0.15; 2.07÷0.23÷0.45; 1.36÷0.8-12.9; 7.28+3.2÷2.5.

问题描述:

脱式计算:
0.75×18÷0.15;    2.07÷0.23÷0.45;      1.36÷0.8-12.9;     7.28+3.2÷2.5.

(1)0.75×18÷0.15
=13.5÷0.15
=90;
(2)2.07÷0.23÷0.45
=9÷0.45
=20;
(3)1.36÷0.8-12.9
=1.7-12.9
=-11.2;
(4)7.28+3.2÷2.5
=7.28+1.28
=8.56.