Răspuns:
a) (4*6+2)=28
8+5x(20+3x28-15)-3=
28x3=84
8+5x(20+84-15)-13=
84-15+20=89
8+5x89-13=
89x5=445
8+445-13=
445-13+8=440
b)(14x2-40:4)=
40:4=10
(14x2-10)=
14x2=28
28-10=18
(150+128-18)x10=
128-18=110
(150+110)x10=
150+110=260
260x10=2600
c)(5+25x1-24:4)=
24:4=6
(5+25x1-6)=
25-6+5=24
5+5-(5+2x24)=
24x2=48
48+5=53
5+5-53=
53-5+5=53