zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

3/4 x[ 2/7+5/8 ]= 3/4 (x^2)/7

解答

\frac{3}{4} x [\frac{2}{7} + \frac{5}{8}] = \frac{3}{4} \frac{x ^{2}}{7}

解答

x = \frac{51}{8}, x = 0

+1

十进制

x = 6.375, x = 0

求解步骤

\frac{3}{4} x [\frac{2}{7} + \frac{5}{8}] = \frac{3}{4} \cdot \frac{x ^{2}}{7}

化简

4 \cdot 7 : 28

\frac{3}{4} x [\frac{2}{7} + \frac{5}{8}] = \frac{3 x ^{2}}{28}

找到

4, 28

的最小公倍数:

28

乘以最小公倍数=

28

\frac{3}{4} x [\frac{2}{7} + \frac{5}{8}] \cdot 28 = \frac{3 x ^{2}}{28} \cdot 28

化简

21 (\frac{2}{7} + \frac{5}{8}) x = 3 x^{2}

展开

21 (\frac{2}{7} + \frac{5}{8}) x : \frac{153}{8} x

\frac{153}{8} x = 3 x^{2}

交换两边

3 x^{2} = \frac{153}{8} x

将

\frac{153}{8} x

para o lado esquerdo

3 x^{2} - \frac{153}{8} x = 0

改写成标准形式

a x^{2} + b x + c = 0

3 x^{2} - \frac{153 x}{8} = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - \frac{153}{8} ) \pm ( - \frac{153}{8} ) ^{2} - 4 \cdot 3 \cdot 0}{2 \cdot 3}

(- \frac{153}{8})^{2} - 4 \cdot 3 \cdot 0 = \frac{153}{8}

x_{1, 2} = \frac{- ( - \frac{153}{8} ) \pm \frac{153}{8}}{2 \cdot 3}

将解分隔开

x_{1} = \frac{- ( - \frac{153}{8} ) + \frac{153}{8}}{2 \cdot 3}, x_{2} = \frac{- ( - \frac{153}{8} ) - \frac{153}{8}}{2 \cdot 3}

x = \frac{- ( - \frac{153}{8} ) + \frac{153}{8}}{2 \cdot 3} : \frac{51}{8}

x = \frac{- ( - \frac{153}{8} ) - \frac{153}{8}}{2 \cdot 3} : 0

二次方程组的解是:

x = \frac{51}{8}, x = 0

作图

流行的例子

17 x^{2} - 40 x + 8 = 0

9x^2+8(k-5)x+64=0

9 x^{2} + 8 (k - 5) x + 64 = 0

solvefor t,s=v_{0}*t+a*t^2

so l v e f or t, s = v_{0} \cdot t + a \cdot t^{2}

solvefor y,9y^2=x*(3-x)^2

so l v e f or y, 9 y^{2} = x \cdot (3 - x)^{2}

y (y + 5) = 14