Если не поймёшь мой почерк пиши.
2х+8-12=x^2-7x
2x+7x-x^2=4
x^2+9x=4
16-88у+121у²-1=0
121у²-88у+15=0
у₁=<u>88+√(7744-7260)</u> = <u>88+22</u> = <u>110</u> = 5/11
242 242 242
у₂=<u>88-√(7744-7260)</u> = <u>88-22</u> = <u>66</u> = 3/11
242 242 242
16t²-24t+9-25t²=0
-9t²-24t+9=0
3t²+8t-3=0
t₁=<u>-8+√(64+36)</u> = <u>-8+10</u> = 1/3
6 6
t₂=<u>-8-√(64+36)</u> = <u>-8-10</u> = -3
6 6
X1+x2=25
x1*x2=144
x²-25x+144=0
D=625-576=49
x1=(25+7)/2=16
x2=(25-7)/2=9