Răspuns:
Explicație pas cu pas:
1.
2x+3y=5 2x+3y=5
-x+2y=8 (2) -2x+4y=16
........................
7y=21 y=3 x=2y-8=-2
2. -4x+5y=17 -4x+5y=17
x-y=3 (4) 4x-4y=-12
.......................
y=5 x=y+3=8
3 .
(1-x)²+(2-x)²=(3-x)² 1-2x+x²+4-4x+x²=9-6x+x²
x²=9-5 x²-4=0 fiind laturi x=2 nu convine , o cateta ar fi zero
x=-2 cateta1=1+2=3u ; cateta 2=2+2=4u ipotenuza=3+=5u u-unitati
4. f(x)=2x-1 f(√2)-f(1)/(√2-1)=(2√2-1-2+1)/(√2-1)=2(√2-1)/(√2-1)=2
f(√3)-f(√2)/(√3-√2)=(2√3-1-2√2+1)/(√3-√2)=
=2(√3-√2)/(√3-√2)=2
f(√2)-f(1)/(√2-1)+ f(√3)-f(√2)/(√3-√2)=2+2=4∈N
5. f(x)=x/3-1/2
a=f(4)=4/3-1/2=(4×2-3)/6=5/6
b=-√2
ma=(5/6-√2)/2=(5-6√2)/2
