#1 упростите выражение. #2 решите неравенство
1 (x-y)(x²+xy+y²)/(x+y)(x²-xy+y²)* (x²-xy+y²)/(x-y)=(x²+xy+y²)/(x+y) 2 a)9-(5x-2)/2>x+5 9*2-(5x-2)>2)x+5) 18-5x+2>2x+10 -5x-2x>10-20 -7x>-10 x<10/7<br>b)7/4+2x/3≤x+5/3 7*3+2x*4≤12*x+5*4 21+8x≤12x+20 8x-12x≤20-21 -4x≤-1 x≥1/4