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15) Alternanţe: i, a! (2x3+5x)-3x2= 4 x 5; ax4-15 = (80 - 75) × 5; (6 x 4-ix 3) + 9 x 4 = 3 × 10 + 3 × 3; 96 - (8 x 4 + ax 3) = 5 x 6 + 19; 96 (9 x 5-9x) = 5x 6 + 57; 96-(5x5+ ax 6-40) x 2 = 9 × 10. - repde dau 59 de puncte!!;​