A)3,72+2/5=3,72+0,4=4,12
б)3/7+0,5=3/7+1/2=(6+7)/14=13/14
5/ 22 пиши однерку на 8/ 11 пиши
двойку
=(5-16/22)×11/5=-11/22×11/5=11/10=1.1
0<=cos x<=1
max: sqrt(16+9*1)=5
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1) {y=6-x; x^2+3x-22=0 D=9+22*4=97; x1,2=(-3<span>±sqrt97)/2
</span>_
| { x=(-3+sqrt97)/2; y=6-(-3+sqrt97)/2
|_{x=(-3-sqrt97)/2; y=6-(-3-sqrt97)/2
_
| { x=(-3+sqrt97)/2; y=(15+sqrt97)/2
|_{x=(-3-sqrt97)/2; y=(15-sqrt97)/2
2) {x^2-2y^2+x^2+2y^2=12-4; x^2-2y^2=-4
{2x^2=8; x^2-2y^2=-4
{x^2=4; x^2-2y^2=-4
{x=±2; x^2-2y^2=-4
_
| {x=2; 4-2y^2+4=0
|_{x=-2; 4-2y^2+4=0
_
| {x=2; -2y^2=-8
|_{x=-2; -2y^2=-8
_
| {x=2; y^2=4
|_{x=-2; y^2=4
_
| {x=2; y=±2
|_{x=-2; y=±2