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Calculează: 324 ×27 -40: 5 + (a×7-12) =8784

Răspuns :

324 ×27 - 40: 5 + (a×7-12) =8 784

8 748 - 8 + (a × 7 - 12) = 8 784

8 740 + (a × 7 - 12) = 8 784

a × 7 - 12 = 8 784 - 8 740

a × 7 - 12 = 44

a × 7 = 44 + 12

a × 7 = 56

a = 56 : 7

a = 8
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