1) 1/2-(+4)=1/2-4=1/2-4/1=1/2-8/2=-7/2=-3 1/2
2) -5/11-(-5/11)=-5/11+5/11=0
3) -5-(-2 1/3)=-5+2 1/3=-5/1+7/3=-15/3+7/3=-8/3=-2 2/3
4) -8-(-1/7)=-8+1/7=-8/1+1/7=-56/7+1/7=-55/7=-7 6/7
5) 1/6-(+3)=1/6-3=1/6-3/1=1/6-18/6=-17/6=-2 5/6
6) -5/12-(-4)=-5/12+4=-5/12+4/1=-5/12+48/12=43/12=3 7/12
1.х=3.1,3.2,3.2,3.3,3.4,3.5
2.х=3.21,3.22,3.23,3.24,3.25
3.х=5.221,5.222,5.223,5.224,5.225
=(x²-2)²-2(x²-2)2+2²=((x²-2)-2)²=(x²-2-2)²=(x²-4)²=(x²-2²)²=((x-2)(x+2))²=(x-2)²(x+2)²=(x-2)(x-2)(x+2)(x+2)
Только не до конца уверен в 3