脱式计算. 1+0.45÷0.9-0.75 20×40%+5÷25% 14/15÷(15-1/2-1/2)
问题描述:
脱式计算.
1+0.45÷0.9-0.75
20×40%+5÷25%
÷(15-14 15
-1 2
) 1 2
答
(1)1+0.45÷0.9-0.75
=1+0.5-0.75
=1.5-0.75
=0.75
(2)20×40%+5÷25%
=20×0.4+5÷0.25
=8+20
=28
(3)
÷(15-14 15
-1 2
)1 2
=
÷1414 15
=
1 15