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受欢迎的代数 >

220-(16.5-2x)^2=99.9

解答

220 - (16.5 - 2 x)^{2} = 99.9

解答

x = 2.77049 \dots, x = 13.72950 \dots

求解步骤

220 - (16.5 - 2 x)^{2} = 99.9

将

220

到右边

- (16.5 - 2 x)^{2} = - 120.1

两边除以

- 1

(16.5 - 2 x)^{2} = 120.1

对于

(g (x))^{2} = f (a)

解为

g (x) = f (a), - f (a)

解

16.5 - 2 x = 120.1 : x = 2.77049 \dots

解

16.5 - 2 x = - 120.1 : x = 13.72950 \dots

二次方程组的解是:

x = 2.77049 \dots, x = 13.72950 \dots

作图

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