Efectuează, respectând regulile învățate: a) (8+19):3=
49:(3+4)=
(5:5+5:1)+(30:10)=

b) (28:4_6)×(7×9_60)=
(23_12:3×0) +(7×8_4×4)=
(64_24):4×5_(6×8×1)=
100:10×0:7 +40:5=

c). 23+(8×8+6):10×2=
(6×8:4_20:5×3+6×7:1) :(18:3:3+32:8)=
(8×7+7×7+6×7) _(24:3+80:8+35:7)=
(9×3:3+40:8) : 2+899=
(64:8:2+3×10:6) × 63:7_24:6) +378=

vă rog ajutați mă ​