（2013•徐州模拟）正确，合理计算50+2.5÷43−0.75×0.5−75%523×38+516×223+1023×51621−[(2.75−512)÷13]1285-199．

Question

（2013•徐州模拟）正确，合理计算
50+2.5÷(4)/(3)−0.75×0.5−75%
(5)/(23)×(3)/(8)+(5)/(16)×(2)/(23)+(10)/(23)×(5)/(16)
21−[(2.75−(5)/(12))÷(1)/(3)]
1285-199．

Answer 1

（1）50+2.5÷(4)/(3)-0.75×0.5-75%
=50+0.75×（2.5-0.5-1）
=50+0.75×1
=50.75；

（2）(5)/(23)×(3)/(8)+(5)/(16)×(2)/(23)+(10)/(23)×(5)/(16)
=(5)/(23)×(3)/(8)+(5)/(23)×(2)/(16)+(5)/(23)×(10)/(16)
=(5)/(23)×（(3)/(8)+(2)/(16)+(10)/(16)）
=(5)/(23)×(9)/(8)
=(45)/(184)；

（3）21-[（2.75-(5)/(12)）÷(1)/(3)]
=21-[(7)/(3)÷(1)/(3)]
=21-7
=14；

（4）1285-199
=1285-200+1
=1085+1
=1086．