Question

va rog ajutați ma, dau coroana ​

Answer 1

Răspuns:

a) = 3x²-2x+12x-8-2x²+10x-(x²-3x-4x+12)

= 3x²-2x+12x-8-2x²+10x-(x²-7x+12)

= 3x²-2x+12x-8-2x²+10x-x²+7x-12

= 0+27x-20

= 27x-20

b) = 4x²-5x-12x+15-3x²+18x-(x²+5x+4x+20)

= 4x²-5x-12x+15-3x²+18x-(x²+9x+20)

= 4x2-5x-12+15-3x²+18x-x²-9x-20

= 0-8x-5

= -8x-5

c) = 4x²-7x-8x+14+2x²-4x-5x+10-(3x²+9x+2x+6)

= 4x²-7x-8x+14+2x²-4x-5x+10-(3x²+11x+6)

= 4x²-7x-8x+14+2x²-4x-5x+10-3x²-11x-6

= 3x²-7x-8x+14-4x-5x+10-11x-6

= 3x²-35x+14+10-6

= 3x²-35x+18

d) = 3x²+4x+9x+12-(2x²+12x-x-6)+x²+5x-3x-15

= 3x²+4x+9x+12-(2x²+11x-6)+x²+5x-3x-15

= 3x²+4x+9x+12-2x²-11x+6+x²+5x-3x-15

= 2x²+4x+9x+12-2x²-11x+6+5x-3x-15

= 2x²+4x+12+6-15

= 2x²+4x+3

EVERGREEN