Răspuns :
1) ⇒(x²-1)(x²+1)/(x²+1) se simplifica=x²-1
x²-1=0
x²=1
X1=1
X2=-1
S={-1,1}
2)4x-3≤2x+15
4x-2x≤15+3
2x≤18
x≤18/2
x≤9
x∈(-α,9]
x²-1=0
x²=1
X1=1
X2=-1
S={-1,1}
2)4x-3≤2x+15
4x-2x≤15+3
2x≤18
x≤18/2
x≤9
x∈(-α,9]
2) 4x-2x≤18 => x≤9 x e (-infinit ; 9]
3) BD'=d => d²=L²+l²+h² => d²=16+25+36=> d²=77 => d=√77
4) V= πR²h=> V=π 16 x 2=> V=32π
3) BD'=d => d²=L²+l²+h² => d²=16+25+36=> d²=77 => d=√77
4) V= πR²h=> V=π 16 x 2=> V=32π