X - 2 + 3x = 5
4x = 7
x = 7/4
Х=2у-3
7(2у-3)-10у=7
4у-21=7
4у=28
у=7
х=2×7-3=11
-2(a+2)/2(a-2)(a+2)-2/a(a+2)=1/(2-a)-2/a(a+2)=a^2+2a-4+2a/a(4-a^2)=
Y`=12/cos²x -12=0
cos²x=1
1+cos2x=2
cos2x=1
2x=2πn
x=πn
x=0∈[-π/4;π/4]
y(-π/4)=12*(-1)-12*(-π/4)+3π-7=-12+3π+3π-7=-19+6π≈-0,16
y(0)=12*0-12*0+3π-7≈2,42
y(π/4)=12*1-3π+3π-7=5 наиб
4a²x-9x=2a+3
x(4a²-9)=2a+3
x=(2a+3)/(2a+3)(2a-3)=1/(2a-3)
a≠1,5