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When Xiao Li solved the equation 5a-x = - 8-4x + 3A about X, he mistook the left-x as + X, and got the solution of the equation as x = - 2 to solve the original equation Thank you. I can do it. It's just the first time I try Baidu
Then the equation of small lie calculation is 5a-2 = - 8 + 8 + 3a, 2A = 2A = 1
So the original equation is 5-x = - 8-4x + 3
Judge whether the following equation has real roots, and there are several real roots x Λ 3 - 3x-1 = 0 3 Λ X-1 - INX = 0
f(x)=x^3-3x-1
f'(x)=3x^2-3=0-->x=-1,1
F (- 1) = 1 > 0 is the maximum
f(1)=-3
The maximum and minimum distance between the point on the circle (x-1) ^ 2 + (Y-2) ^ 2 = 9 and the line 3x + 4Y + 19 = 0
Distance from center of circle (1,2) uses the distance formula from point to line, d = | 3x + 4Y + 19 | / root sign (3 ^ + 4 ^ 2) = | 3x + 4Y + 19 | / 5 = (3 + 8 + 19) / 5 = 6 (D is the distance from center of circle to line), and the minimum value is D-R = 6-3 = 3
The corresponding maximum value is d + r = 6 + 3 = 9, hope to adopt, thank you
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