Odpowiedź:
1.
a) 2a -3b + 5a-9b =7a -12b
b)13x+2y+2-24x+7y-27=(-11x)+9y-25
c)5a-11b+4+7a+8b-7b+8=12a-10b+12
d)-25x+y+31x+17-52x-26y+9=(-46)+y+26
e)3x²-4-18+4x²+15x²+7x-15-25= 22x²+7x-52
f)a²-ab+5-3a²+4-7a²-8ab+2ab - 7=(-9a²)-7ab
2.
a) 4x+3y-2x+7y-3=2x+10y-3
b)12x²-y-3-2x²-3y+1+4x²-5y+18=14x²-9y+15
c)5a-12,5b+4,5+3,3a+2,2b-7,3-4,2+a+10,36=9,3a-10,3b+3,36
d)2x-7-3y+5x+15z-4y+3x-11z+7=11x-7y+4z
