[1-(7/15+0.35*17/5)÷17/9】*25/8-11/12*(3/4-0.75)

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[1-(7/15+0.35*17/5)÷17/9】*25/8-11/12*(3/4-0.75)
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[1-(7/15+0.35*17/5)÷17/9】*25/8-11/12*(3/4-0.75)
[1-(7/15+0.35*17/5)÷17/9】*25/8-11/12*(3/4-0.75)

[1-(7/15+0.35*17/5)÷17/9】*25/8-11/12*(3/4-0.75)
[1-(7/15+0.35*17/5)÷17/9]*25/8-11/12*(3/4-0.75)
=[1-(7/15+0.07*17)*9/17]*25/8-11/12*0
=[1-(7/15*9/17+0.07*17*9/17]*25/8
=[1-(6/85+0.63]*25/8
=[0.37-6/85]*25/8
=[37/100-6/85]*25/8
=509/1700*25/8
=509/544

。。。。好难