用递等式计算: 36+61.2÷12 (20-1.4÷2)×0.4 54÷(3.94+6.86)×0.8.
问题描述:
用递等式计算:
36+61.2÷12
(20-1.4÷2)×0.4
54÷(3.94+6.86)×0.8.
答
①36+61.2÷12
=36+61.2÷12
=36+5.1
=41.1
②(20-1.4÷2)×0.4
=(20-0.7)×0.4
=19.3×0.4
=7.72
③54÷(3.94+6.86)×0.8
=54÷10.8×0.8
=5×0.8
=4