вычисли удобным способом 67+24 48+15 26+39+17 18+68+9

1)67+24=67+20+4=91.2)48+15=48+10+5=633)26+39+17=26+30+9+10+7=824)18+68+9=18+60+8+9=95

67 + 24 = 67 + 3 + 20 = 70 + 20 = 9048 + 15 = 48 + 2 + 13 = 50 + 13 = 6326 + 39 + 17 = 39 + 1 + 26 + 4 + 12 = 40 + 30 + 12 = 8218 + 68 + 9 = 68 + 2 + 18 + 2 + 5 = 70 + 20 + 5 = 95