脱式计算:5/8÷75%- 2/19×38% (3/8+37.5%)÷(2.1-209%) 2.5×125×32
问题描述:
脱式计算:5/8÷75%- 2/19×38% (3/8+37.5%)÷(2.1-209%) 2.5×125×32
答
5/8÷75%- 2/19×38%
=5/8×100/75-2/19×38/100
=5/6-1/25
=119/150
(3/8+37.5%)÷(2.1-209%)
=(0.375+0.375)÷(2.1-2.09)
=0.75÷0.1
=0.75×10
=7.5
2.5×125×32
=2.5×32×125
=2.5×4×4×2×5×25
=10×10×100
=10000