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受欢迎的代数 >

((2X-1))/(5+4)=((X+5))/(2+1)

解答

\frac{( 2 X - 1 )}{5 + 4} = \frac{( X + 5 )}{2 + 1}

解答

X = - 16

求解步骤

\frac{( 2 X - 1 )}{5 + 4} = \frac{( X + 5 )}{2 + 1}

使用分式交叉相乘: 若

\frac{a}{b} = \frac{c}{d}

则

a \cdot d = b \cdot c

(2 X - 1) (2 + 1) = (5 + 4) (X + 5)

化简

3 (2 X - 1) = 9 (X + 5)

展开

3 (2 X - 1) : 6 X - 3

展开

9 (X + 5) : 9 X + 45

6 X - 3 = 9 X + 45

将

3

到右边

6 X = 9 X + 48

将

9 X

para o lado esquerdo

- 3 X = 48

两边除以

- 3

X = - 16

作图

流行的例子

x + 3 (x + 2) = 18

3(3x-2)-7x=6(2x-1)-10x

3 (3 x - 2) - 7 x = 6 (2 x - 1) - 10 x

4 x - 3 = - 2 x + 9

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

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

\frac{x - 8}{5} + 3 = 6