(2x-1)²-169=0求x 5a²-26a=50求a
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(2x-1)²-169=0求x5a²-26a=50求a(2x-1)²-169=0求x5a²-26a=50求a(2x-1)²-169=0求x5a
(2x-1)²-169=0求x 5a²-26a=50求a
(2x-1)²-169=0求x 5a²-26a=50求a
(2x-1)²-169=0求x 5a²-26a=50求a
(1)
(2x-1)²-169=0
(2x-1)²=169
2x-1=±13
所以:
2x-1=13或者2x-1=-13
x=7或者x=-6
(2)5a²-26a=50
5a²-26a-50=0
a=26±√(26²+4×5×50)/10=13±√419/5
x=-6或7,
(2x-1)²-169=0
(2x-1)²=169
2x-1=13或2x-1=-13
x1=7,x2=-6
5a²-26a=50
a²-26/5 a=10
a²-26/5 a+169/25=10+169/25
(a-13/5)²=419/25
a-13/5=√419/ 5,或a-13/5=-√419 / 5
a1=(13+√419)/5 ,a2= (13-√419)/5
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