1) а) 3b+(5a-7b)= 3b+5a-7b=5a-4b<span>
</span><span>б) -3q-(8p-3q)= -3q-8p+3q=-8p</span><span>
</span><span>в) 5x+(11-7x)= 5x+11-7x=11-2x</span><span>
</span><span>г) -(8c-4)+4=-8c+4+4</span>=-8c+8<span>
2) а) (2+3a)+(7a-2)=
2+3a+7a-2=10a</span><span>
</span><span>б) -(11a+b)-(12a-3b)= -11a-b-12a+3b=-23a+2b</span><span>
</span><span>в) (5-3b)+(3b-11)= 5-3b+3b-11=-6</span><span>
</span><span>г) (5a-3b)-(2+5a-3b)= 5a-3b-2-5a+3b=-2</span>
3y-2x=69=> 1.5y-x=34.5
4.5x+2y=536=> x+(2/4.5)y=536/4.5
1.5y-x+x+(2/4.5)y=34.5+536/4.5
(27/18)y + (8/18)y = (621+2144)/18
(35/18)y=2765/18
y= 2765/35
y=79
3*79-2x=69
x=(237-69)/2
x=84
4xy−36x−5y+45 = (<span>4xy−36x) − (5y-45) = 4х(y-9) - 5(y-9) =(4x-5)(y-9)</span>