计算．（能简算的要简算）34÷(34-23)3.2×1.25×251.28+9.8+7.02+10.256÷23÷59+1412×(56-34)÷12815×310÷415-15．

Question

计算．（能简算的要简算） (3)/(4)÷((3)/(4)-(2)/(3))	3.2×1.25×25	1.28+9.8+7.02+10.2
(5)/(6)÷(2)/(3)÷(5)/(9)+(1)/(4)	12×((5)/(6)-(3)/(4))÷(1)/(2)	(8)/(15)×(3)/(10)÷(4)/(15)-(1)/(5)．

Answer 1

（1）(3)/(4)÷((3)/(4)-(2)/(3))
=(3)/(4)÷(1)/(12)
=9；

（2）3.2×1.25×25
=（4×0.8）×1.25×25
=（4×25）×（0.8×1.25）
=100×1
=100；

（3）1.28+9.8+7.02+10.2
=（1.28+7.02）+（9.8+10.2）
=8.3+20
=28.3；

（4）(5)/(6)÷(2)/(3)÷(5)/(9)+(1)/(4)
=(5)/(4)÷(5)/(9)+(1)/(4)
=(9)/(4)+(1)/(4)
=(5)/(2)；

（5）12×((5)/(6)-(3)/(4))÷(1)/(2)
=12×(1)/(12)÷(1)/(2)
=1÷(1)/(2)
=2；

（6）(8)/(15)×(3)/(10)÷(4)/(15)-(1)/(5)
=(4)/(25)÷(4)/(15)-(1)/(5)
=(3)/(5)-(1)/(5)
=(2)/(5)．