1)-4a+3b-2a+7b=-6a+10b
2)0,3x-2(0,7+0,5y)+1/10x=0,3x-1,4-1y+1/10x=0.4x-1,4-1y
<span>3(2х-1)-4(х+3)>5x</span>
<span>6x-3-4x-12>5x</span>
<span>6x-4x-5x>12+3</span>
<span>-3x>15</span>
<span>x<-5</span>
3а+7b
3×(-0.2)+7×0.7= 4.3
3×1,5+7×(-0.2)=3.1
4.3>3.1
(7х"2-5х+3)-(5х"2-4)=7х"2-5х+3-5х"2+4=2х"2-5х+7