609:3+852:4-695:5=
=203+213-139
=416-139
= 377
170×10:17-(120-45)×2:5=
=1700:17-75×2:5
=170- 150:5
=170-30
=150
383+(1000-502):6=
=383+498:6
=383+83
=466
[472+51×4-(480:4+32×5)]×1000=
=[472+204-(120+160)]×1000
=[472+204-280]×1000
=[676-280]×1000
=396×1000
=396 000
3000-5×[41+(84-8×8:4):2]=
=3000-5×[41+(84-16:4):2]
=3000-5×[41+(84-4):2]
=3000-5×(41+80:2)
=3000-5×(41+40)
=3000-5×81
=3000-405
=3595
