1258+140:70+50×3-36=

140:70=2

50×3=150

1258+2=1260

150-36=114

1260+114=1374

4078 x 7 — 204 : 6 + 777 : 3 =

4078×7=28546
204:6=34
777:3= 259

28546 — 34 =28512

28512+259=28771

1. 3×2500 = 7500
2.1800 x 2 = 3600
3.7500 + 3600 + 1200 = 12300
4.20000 — 12300 = 7700