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受欢迎的代数 >

2x(x+3)=(x+1)(2x-5)

解答

2 x (x + 3) = (x + 1) (2 x - 5)

解答

x = - \frac{5}{9}

+1

十进制

x = - 0.55555 \dots

求解步骤

2 x (x + 3) = (x + 1) (2 x - 5)

展开

2 x (x + 3) : 2 x^{2} + 6 x

展开

(x + 1) (2 x - 5) : 2 x^{2} - 3 x - 5

2 x^{2} + 6 x = 2 x^{2} - 3 x - 5

两边减去

2 x^{2} - 3 x

2 x^{2} + 6 x - (2 x^{2} - 3 x) = 2 x^{2} - 3 x - 5 - (2 x^{2} - 3 x)

化简

9 x = - 5

两边除以

9

x = - \frac{5}{9}

作图

流行的例子

3^2+(x+1)^2=(x+2)^2

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

(6x-8}{33}=\frac{x-2)/3-(1-5x)/6

\frac{6 x - 8}{33} = \frac{x - 2}{3} - \frac{1 - 5 x}{6}

solvefor a,a+b=3

so l v e f or a, a + b = 3

(3x)/4+(2x)/3 = 17/12

\frac{3 x}{4} + \frac{2 x}{3} = \frac{17}{12}

(2 - 2 i) z = 10