Question

Podem me dar a explicação? Por favor.

Answer 1

Olá, Emilly!

a) $(-3x^2 + 5x - 8) + (6x^2 -4x - 3)\\\\ -3x^2 + 5x - 8 + 6x^2 - 4x -3\\\\ -3x^2 + 6x^2 + 5x - 4x - 8 - 3\\\\ \boxed{3x^2 + x - 11}$



b) $(8ab - 7bc +3ac) + (-5bc + 3ab -ac)\\\\8ab - 7bc +3ac -5bc+3ab-ac\\\\8ab+3ab -7bc-5bc+3ac-ac\\\\ \boxed{11ab -12bc +2ac}$



c) $(-\frac{3x}{2} - \frac{y}{3} ) + ( \frac{x}{5} - \frac{y}{4}) + (2x+ y) \\\\ (\frac{-9x-2y}{6} + \frac{4x -5y}{20}) + (2x+y)\\\\ (\frac{-90x - 20y+12x-15y}{60}) + (2x+y)\\\\ (\frac{-78x+-35y}{60}) + (2x +y) \\\\ \frac{-78x-35y+120x+60y}{60}\\\\ \boxed{\frac{42x+25y}{60}} \\\\ ou \\\\ \boxed{\frac{7x + 5y}{2}}$




d) $(\frac{a}{2} +b - 6) + ( \frac{2a}{3} + 2b- 5) \\\\ \frac{a}{2} + \frac{2a}{3}+ b + 2b - 5 - 6\\\\ \frac{3a+4a}{6} + 3b - 11 \\\\ \frac{7a+3b-11}{6} \\\\{7a+ 18b -66}\\\\ \boxed{7a + 3b - 66}$


Forte abraço.