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受欢迎的代数 >

(x)^2+(-3/7)^2=1

解答

(x)^{2} + (- \frac{3}{7})^{2} = 1

解答

x = \frac{2 10}{7}, x = - \frac{2 10}{7}

+1

十进制

x = 0.90350 \dots, x = - 0.90350 \dots

求解步骤

x^{2} + (- \frac{3}{7})^{2} = 1

展开

x^{2} + (- \frac{3}{7})^{2} : x^{2} + \frac{9}{49}

x^{2} + \frac{9}{49} = 1

将

\frac{9}{49}

到右边

x^{2} = 1 - \frac{9}{49}

化简

1 - \frac{9}{49} : \frac{40}{49}

对于

x^{2} = f (a)

解为

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

x = \frac{40}{49}, x = - \frac{40}{49}

\frac{40}{49} = \frac{2 10}{7}

- \frac{40}{49} = - \frac{2 10}{7}

x = \frac{2 10}{7}, x = - \frac{2 10}{7}

作图

流行的例子

4 x^{2} + 4 = 5 x

-0.0625x^2+2x+50=60

- 0.0625 x^{2} + 2 x + 50 = 60

solvefor x,f(x-3)=x^2-1

so l v e f or x, f (x - 3) = x^{2} - 1

solvefor x,f(x-3)=x^2-2

so l v e f or x, f (x - 3) = x^{2} - 2

2 x + 4 = (x - 2)^{2}