(7/9-5/6+17/18)*18+1.45*8-3.95*8
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(7/9-5/6+17/18)*18+1.45*8-3.95*8(7/9-5/6+17/18)*18+1.45*8-3.95*8(7/9-5/6+17/18)*18+1.45*8-3.95*8(7/9
(7/9-5/6+17/18)*18+1.45*8-3.95*8
(7/9-5/6+17/18)*18+1.45*8-3.95*8
(7/9-5/6+17/18)*18+1.45*8-3.95*8
(7/9-5/6+17/18)*18+1.45*8-3.95*8
=7/9*18-5/6*18+17/18*18+8*(1.45-3.95)
=14-15+17-8*2.5
=16-20
=-4
(7/9-5/6+17/18)*18+1.45*8-3.95*8
=（7/9)*18-（5/6)*18+（17/18)*18+（1.45-3.95）*8
=14 - 15+17-2.5*8
=16-20
=-4