1. x²-25=0
x=+-5
2. При x=5.
5+3=а
а=8
5-3=b
b=2
a*b=16
3. При x=-5
-5+3=a
a=-2
-5-3=b
b=-8
a*b=16
Xn=3n-1/n;
x1=3-1=2;
x2=3·2-1/2=6-1/2=5¹/₂;
x3=3·3-1/3=9-1/3=8²/₃;
x4=3·4-1/4=12-1/4=11³/₄;
x5=3·5-1/5=15⁴/₅;
x100=3·100-1/100=300-1/100=299⁹⁹/₁₀₀;
x1000=3·1000-1/1000=2999⁹⁹⁹/₁₀₀₀;;
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