解方程6x+5)(6x-5)-(6x-1)^2=-20
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解方程6x+5)(6x-5)-(6x-1)^2=-20解方程6x+5)(6x-5)-(6x-1)^2=-20解方程6x+5)(6x-5)-(6x-1)^2=-20(6x+5)(6x-5)-(6x-1)
解方程6x+5)(6x-5)-(6x-1)^2=-20
解方程6x+5)(6x-5)-(6x-1)^2=-20
解方程6x+5)(6x-5)-(6x-1)^2=-20
(6x+5)(6x-5)-(6x-1)²=-20
(6x)²-25-(6x)²+12x-1=-20
12x-26=-20
12x=26-20
12x=6
x=1/2
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(6x+5)(6x-5)-(6x-1)^2=-20
36x^2-25-(36x^2-12x+1)=-20
36x^2-25-36x^2+12x-1=-20
36x^2-36x^2+12x-1-25=-20
12x-26=-20
12x=6
x=1/2
36x2 - 25-(36x2-12x+1)=-20
-25+12x-1=-20
12x=6
x=0.5
(6x)^2-5^2-[(6x)^2-2乘以6x乘以1]=-20
36x^2-25-36x^2+2乘以6x乘以1-1=-20
12x=1+25-20
12x=6
x=二分之一
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