7.3x1.2-1.8

=0.6*(2*7.3-3)

=0.6*11.6

=8.76

5.3×1.2+5.3×1.8

=5.3×(1.2+1.8)

=5.3×3

=15.9

1.8+1.2÷(1.8+1.2)

=1.8+1.2÷3

=1.8+0.4

=2.2

(1.2+3.6/1.8)*40

(1.2+2)*40

3.2*40

128

2.92-1.8+0.08-1.2

=（2.92+0.08）-（1.8+1.2）

=3-3

=0

朋友,请及时采纳正确答案,下次还可能帮您,您采纳正确答案,您也可以得到财富值,谢谢。

550/450/1.8*1.2

=11*1.2/(9*1.8)

=22/27

这么晚还不休息

用简算:

3.6+3÷1.2

=3.6+2.5

=6.1

(5.64-1.8×2.4)÷1.2

=（5.64-4.32）÷1.2

=1.32÷1.2

=1.1

第一个为0.2《把0.5看成1/2》

第二个为72.5《提出0.725》

1.46÷7.3×0.2

=1.46x0.2/7.3

=0.292/7.3

=2.92/73

=0.04