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受欢迎的代数 >

7x^2-12=0

解答

7 x^{2} - 12 = 0

解答

x = \frac{2 3}{7}, x = - \frac{2 3}{7}

+1

十进制

x = 1.30930 \dots, x = - 1.30930 \dots

求解步骤

7 x^{2} - 12 = 0

将

12

到右边

7 x^{2} = 12

两边除以

7

x^{2} = \frac{12}{7}

对于

x^{2} = f (a)

解为

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

x = \frac{12}{7}, x = - \frac{12}{7}

\frac{12}{7} = \frac{2 3}{7}

- \frac{12}{7} = - \frac{2 3}{7}

x = \frac{2 3}{7}, x = - \frac{2 3}{7}

作图

流行的例子

solvefor x,(x+y+2z)^2+(x+y-2z)^2=8(x+y)z

so l v e f or x, (x + y + 2 z)^{2} + (x + y - 2 z)^{2} = 8 (x + y) z

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

4(ax^2-5x+3)=8x^2+bx+12

4 (a x^{2} - 5 x + 3) = 8 x^{2} + b x + 12

m^{2} + 2 m + 10 = 0

3 x + x^{2} - 1 = 0