Răspuns:
1.357+476+355+233+744+1055=
=(357+233)+(476+744)+(355+1055)=
=590+1220+1410
=1810+1410
=3220
2.a)2798-124:4+39×10=
=2798-31+390
=2767+390
=3157
b)50:(55-50)+(40:4-30×0):2-(9+10:10)=
=50:5+(10-0):2-(9+1)
=10+10:2-8
=10+5-8
=15-8
=7
c)(19+3×167):5-25×4:2=
=(19+501):5-100:2
=520:5-50
=104-50
=54
