Question

calcula:

a) 2y*3+2/3y*5-1/9y*5+5y*5

b) 16a*3-4a*3+7a*3-5a*3

c) -x*2-2x*2-5x*2+7x*2

Answer 1

a) 2/3y^3 + (2/3-1/9+5)y^5
2/3y^3 +50/9y^5
b) (16-4+7-5)a^3 = 14a^3
c) (-1-2-5+7)x^2 = -x^2