170×10:17-85×2:5=
1700:17-85×2:5=
100-85×2:5=
100-170:5=
100-34=66
383+(1000-502):6=
383+498:6=
383+83=466
[472+51×4-(480:4+32×5)]×1000=
[472+51×4-(480:4+160)]×1000=
[472+51+×4-(120+160)]×1000=
(472+51×4-280)×1000=
(472+204-280)×1000=
(676-280)×1000=
396×1000=39600
3000-5×[41+(84-8×8:4):2]=
3000-5×[41+(84-64:4):2]=
3000-5×[41+(84-16):2]=
3000-5×(41+68:2)=
3000-5×(41+34)=
3000-5×75=
3000-375=2625
