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a=5×7-[5×9:9×8:8×7:7×6:6×5:5×4:4×3:3×2:2+3×(14+21×2):8]​

Răspuns :

Explicație pas cu pas:

a = 5 × 7 - [5 × 9:9 × 8:8 × 7:7 × 6:6 × 5:5 × 4:4 × 3:3 × 2:2 + 3 × (14+21×2) : 8]

= 35 - [ 5 × 1 × 1 × 1 × 1 × 1 × 1 × 1 × 1 × 1 + 3 × (14 + 42) : 8]

= 35 - (5 + 3 × 56 : 8)

= 35 - (5 + 21)

= 35 - 26

= 9