Question

Reduza os termos semelhantes
a² + 6a² - 2a² =
17ax - 18ax =
0,7x²y + 3,1x²y =
10bc - 12bc + 7bc - 3bc =
0,9ab³ + 2,5ab³ - 5,2ab³=

Answer 1

$a^2+6a^2-2a^2= 7a2-2a^2=5a^2 \\ \\ 17ax-18ax=-ax \\ \\ 0,7x^2y+3,1x^2y=3,8x^2y \\ \\ 10bc-12bc+7bc-3bc=17bc-15bc=2bc \\ \\ 0,9ab^3+2,5ab^3-5,2ab^3=3,4 ab^3-5,2ab^3=-1,8ab^3$