7÷2.5(简算)2.3÷1.25(简算)

问题描述:

7÷2.5(简算)
2.3÷1.25
(简算)

7/2.5
=7x4/(2.5x4)
=28/10
=2.8
2.3/1.25
=2.3x8/(1.25x8)
=18.4/10
=1.84

7÷2.5
=(7×4)÷(2.5×4)
=28÷10
=2.8
2.3÷1.25
=(2.3×8)÷(1.25×8)
=18.4÷10
=1.84