Sagot :
1) (13-9) x (4.5+7.5)=4x12=48
2) (5x7)+40/8=35+40/8=280/8+40/8=40
3) (3.4+(7.2x2))-(2.3x4)=(3.4+14.4)-9.2=17.8-9.2=8.6
2) (5x7)+40/8=35+40/8=280/8+40/8=40
3) (3.4+(7.2x2))-(2.3x4)=(3.4+14.4)-9.2=17.8-9.2=8.6