80-17×4:20-380:20+90×40:120=
80-17×4:20-380:20+90×40:120=80-68:20-19+3600:120=80-3.4-19+30=87.6380:20+90×40:120
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80-17×4:20-380:20+90×40:120=
80-17×4:20-380:20+90×40:120=80-68:20-19+3600:120=80-3.4-19+30=87.6380:20+90×40:120