脱式计算．260+40×50-4001-0.45÷0.9+0.75（13+215）×456-89÷56×316（1-1100×30）÷7958×[1÷（34+13）]

Question

脱式计算．

260+40×50-400	1-0.45÷0.9+0.75	（(1)/(3)+(2)/(15)）×45
6-(8)/(9)÷(5)/(6)×(3)/(16)	（1-(1)/(100)×30）÷(7)/(9)	(5)/(8)×[1÷（(3)/(4)+(1)/(3)）]

Answer 1

（1）260+40×50-400
=260+2000-400
=2260-400
=1860；

（2）1-0.45÷0.9+0.75
=1-0.5+0.75
=0.5+0.75
=1.25；

（3）（(1)/(3)+(2)/(15)）×45
=(1)/(3)×45+(2)/(15)×45
=15+6
=21；

（4）6-(8)/(9)÷(5)/(6)×(3)/(16)
=6-(16)/(15)×(3)/(16)
=6-(1)/(5)
=5(4)/(5)；

（5）（1-(1)/(100)×30）÷(7)/(9)
=（1-0.3）÷(7)/(9)
=0.7÷(7)/(9)
=0.9；

（6）(5)/(8)×[1÷（(3)/(4)+(1)/(3)）]
=(5)/(8)×[1÷(13)/(12)]
=(5)/(8)×(12)/(13)
=(15)/(26)．