7142.85÷3.7÷2.7×1.7×0.7 (80+8)×25
=1930.5÷2.7×1.7×0.7 89+124+11+26+48
=715×1.7×0.7 25×125×40×84.147×8+8×53
=1215.5×0.7 875-147-23
=850.85 7300÷25÷4
8100÷4÷75
2356-(1356-721) 1235-(1780-1665)
75×27+19×25
(62+8)×10