Explicație pas cu pas:
a) 90 -(37+5):6=
90 - 42:6 =
90 - 7 = 83
100 - (35+21):8=
100 - 56:8=
100 - 7= 93
102 - (19+8):9=
102 - 27:9=
102 - 3 = 99
b) (24+8):4+(36+18):6=
32:4+ 54:6= 8+9= 17
(35 + 15): 5+ (36 + 18): 9 =
50:5 + 54:9= 10+ 6= 16
(81 + 18): 3+ (42 +24) : 6 =
99:3 + 66:6= 33 + 11 = 44
