用递等式计算．1200-570÷750×125（716-2715）÷（7-118）（0.28+0.45×1.6）÷0.147.75×0.75+3.25÷113-3÷4845÷[7.8+58×（234-1.15）][0.3+（223-1.25）÷256]×134．

Question

用递等式计算．

1200-570÷750×125	（7(1)/(6)-2(7)/(15)）÷（7-1(1)/(8)）
（0.28+0.45×1.6）÷0.14	7.75×0.75+3.25÷1(1)/(3)-3÷4
8(4)/(5)÷[7.8+(5)/(8)×（2(3)/(4)-1.15）]	[0.3+（2(2)/(3)-1.25）÷2(5)/(6)]×1(3)/(4)．

Answer 1

（1）1200-570÷750×125　　　　　　
=1200-0.76×125
=1200-95
=1105

（2）（7(1)/(6)-2(7)/(15)）÷（7-1(1)/(8)）
=(52)/(15)÷(47)/(8)
=(52)/(15)×(8)/(47)
=(416)/(705)

（3）（0.28+0.45×1.6）÷0.14　　
=（0.28+0.72）÷0.14　　
=1÷0.14
=(50)/(7)

（4）7.75×0.75+3.25÷1(1)/(3)-3÷4
=7.75×(3)/(4)+3.25×(3)/(4)-(3)/(4)
=（7.75+3.25-1）×(3)/(4)
=10×(3)/(4)
=(15)/(2)

（5）8(4)/(5)÷[7.8+(5)/(8)×（2(3)/(4)-1.15）]
=8(4)/(5)÷[7.8+(5)/(8)×（2.75-1.15）]
=8(4)/(5)÷[7.8+(5)/(8)×1.6]
=8(4)/(5)÷[7.8+1]
=8.8÷8.8
=1

（6）[0.3+（2(2)/(3)-1.25）÷2(5)/(6)]×1(3)/(4)
=[0.3+（2(2)/(3)-1(1)/(4)）÷2(5)/(6)]×1(3)/(4)
=[0.3+(17)/(12)×(6)/(17)]×1(3)/(4)
=[(3)/(10)+(1)/(2)]×1(3)/(4)
=(4)/(5)×(7)/(4)
=(7)/(5)