Explicație pas cu pas:
1) 4856-1022x3-123:3
=4856-3066-41
=1749
2) 6050:5x2-4204:4-1023
=1210x2-1051-1023
=2420-1051-1023
=346
3) 4702x2-1680:7x2+1267
=9404-240x2+1267
=9404-480+1267
=8924+1267
=10 191
4) 6390:9×2-1503:3+128:4
=710x2-501+32
=1420-501+32
=951
hope i helped chu ♡