Question

1) efetue eliminando os parenteses

a) (5x²-2x+3)-(3x²-7x+5)+(2x²-8x-3)

b)(7x³+12x²-4x+3)+(-5x²+7x-4)-(3x³-11)

c)(-12²+16y-10)-(5y²-12y+20)-(10y+y²-7)

d)(7x²-4x+5)-(3x²+9x-3)-(5x+10)

Answer 1

a) (5x²-2x+3)-(3x²-7x+5)+(2x²-8x-3) =
     5x²-2x+3-3x²+7x-5+2x²-8x-3 =        4x² - 3x  - 5

b) (7x³+12x²-4x+3)+(-5x²+7x-4)-(3x³-11)=
    7x³+12x²-4x+3-5x²+7x-4-3x³+11) =  4x³ + 7x²  + 3x + 10

c) (-12y²+16y-10)-(5y²-12y+20)-(10y+y²-7) = 
    -12y²+16y-10-5y²+12y-20-10y-y²+7) = -18y² + 18y - 23

d) (7x²-4x+5)-(3x²+9x-3)-(5x+10) = 
    7x²-4x+5-3x²-9x+3-5x-10) =  4x² - 18x - 2