1) а) 3b+(5a-7b)= 3b+5a-7b= -4b+5a;
б)-3q-(8p-3q)= -3q-8p+3q= -8p;
в) 5x+(11-7x)= 5x+11-7x= -2x+11;
г) -(8c-4)+4= -8c+4+4=-8c+8;
2) a) (2+3a)+(7a-2)= 2+3a+7a-2= 10a;
б)-(11a+b)-(12a-3b)= -11a-b-12a+3b=-23a+2b;
в) (5-3b)+(3b-11)= 5-3b+3b-11=-6;
г) (5a-3b)-(2+5a-3b)= 5a-3b-2-5a+3b=-2;
3) a) a+(a-10)-(12+a)= a+a-10-12-a=a-22;
б) (6x-8)-5x-(4-9x)= 6x-8-5x-4+9x= 10x-12;
в) (1-9y)-(22y-4)-5= 1-9y-22y+4-5= -31y;
г) 5b-(6b+a)-(a-6b)= 5b-6b-a-a+6b= 5b-2a