1
4/7*x*7 3/7=x*(4/7*52/7)=208/49*x=4 12/49*x
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4/7*x=7 3/7
x=7 3/7:4/7
x=52/7*7/4
x=13
2
E=ma²
a=√(E/m) U a=-√(E/m)
-6х<4
х<4:(-6)
х>-2/3в дробе
3x^2+2y^2=77 |*3
9x^2+6y^2=77x
9x^2+6y^2=231
9x^2+6y^2=77x
231-77x=0
-77x=-231
x=3
3*(3)^2+2y^2=77
27+2y^2=77
2y^2=77-27
2y^2=50
y^2=50\2
y^2=25
y=5
Ответ:(3;5)