X + 4 >= 4x - 5
4 + 5 >= 4x - x
9 >= 3x
3 >= x
Ответ: х ∈ (-∞; 3]
(480*50)-145=24000-145=23855
927/9+ 312=103+312=415
(- 2/3 + ( + 6 4/5 ) + ( - 5/6 +( -2,3))
<span>= - 2/3 + 6 4/5 - 5/6 -2,3=
</span>- 2/3 - 5/6 <span>+ 6 4/5 -2,3=-4/6-5/6+6,8-2,3=- 9/6+4,5=-3/2+4,5=-1,5+4,5=3</span>
1/2=(1*10)/(2*10)=10/20=5/10
7/1=(7*10)/(1*10)=70/10
5/10+70/10=75/10