Question

me ajudem por favor?
efetue as adições algébricas:
a- 9x+12x-7x
b- 2/5a - 1/2a
c- ab - 1/3ab
d- qm- 2am +19am
e- o,3x³ + 1,4x³ - 2,8x³ + 0,4x³

Answer 1

$a) \ 9x+12x-7x=14x\\ \\ b) \ \frac{2}{5}a-\frac{1}{2}a=\frac{4a-5a}{10}=-\frac{a}{10}\\ \\ c) \ ab-\frac{1}{3}ab=(1-\frac{1}{3})ab=\frac{2}{3}ab\\ \\ d) \ am-2am+19am=18am\\ \\ e) \ 0,3x^3+1,4x^3-2,8x^3+0,4x^3=-0,7x^3$