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7. Efectuează: a) 4x (6 + 2) = 5 x (9 + 1) = 3x (1+2+ 4) = 9x (2+ 3+ 4) = (1 +6+2) x 7 = b) 4 x (5-2+ 3) + 3x (9-4+ 2) + 4 x (1+2+ 4) = 3 x (6-4+2)+2x (8-5+ 3) + 5 x (1 +3+5) = (5-1+3) x 6+ (8-2-3) x 3 + (6-3-1) x 4 = ndi​