用递等式计算．（1）26+37-50（2）2.5×1.4-8.5÷5（3）（34-18）÷56（4）115÷[（23+15）×126]．

Question

用递等式计算．
（1）26+37-50
（2）2.5×1.4-8.5÷5
（3）（(3)/(4)-(1)/(8)）÷(5)/(6)
（4）(1)/(15)÷[（(2)/(3)+(1)/(5)）×(1)/(26)]．

Answer 1

（1）26+37-50
=63-50
=13

（2）2.5×1.4-8.5÷5
=3.5-1.7
=1.8

（3）（(3)/(4)-(1)/(8)）÷(5)/(6)
=(5)/(8)÷(5)/(8)
=1

（4）(1)/(15)÷[（(2)/(3)+(1)/(5)）×(1)/(26)]
=(1)/(15)÷[(13)/(15)×(1)/(26)]
=(1)/(15)÷(1)/(30)
=2