Explicație pas cu pas:
(60-4×8)×(50-6×7) =(60 - 32) × (50 - 42) = 28×8 = 224
8×9-18:3+6×9- 4×7 =72-6+ 54 - 28= 92
40:5 +63:7 +6× 8 = 8 +9 +48 = 17+48 = 65
100-30:5×8 - 6×4:3 = 100 - 6×8 - 24:3 = 100 - 48 - 8 = 52 - 8 = 44
89 + 64:8×7 - 28:7×4 = 89+ 8×7 - 4×4 = 89 + 56 - 16 = 145-16 = 129