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受欢迎的代数 >

4-2(x+7)-(3x+5)=2x+(4x-9+3x)-(x-3)

解答

4 - 2 (x + 7) - (3 x + 5) = 2 x + (4 x - 9 + 3 x) - (x - 3)

解答

x = - \frac{9}{13}

+1

十进制

x = - 0.69230 \dots

求解步骤

4 - 2 (x + 7) - (3 x + 5) = 2 x + (4 x - 9 + 3 x) - (x - 3)

去除括号:

(a) = a

4 - 2 (x + 7) - (3 x + 5) = 2 x + 4 x - 9 + 3 x - (x - 3)

对同类项分组

4 - 2 (x + 7) - (3 x + 5) = 2 x + 4 x + 3 x - (x - 3) - 9

同类项相加:

2 x + 4 x + 3 x = 9 x

4 - 2 (x + 7) - (3 x + 5) = 9 x - (x - 3) - 9

展开

4 - 2 (x + 7) - (3 x + 5) : - 5 x - 15

展开

9 x - (x - 3) - 9 : 8 x - 6

- 5 x - 15 = 8 x - 6

将

15

到右边

- 5 x = 8 x + 9

将

8 x

para o lado esquerdo

- 13 x = 9

两边除以

- 13

x = - \frac{9}{13}

作图

流行的例子

2 y - 12 = y - 4

x - 2 = \frac{1}{3} x

y = - 4 (1) + 3

3(1-2c)-4=-2(3c-1)

3 (1 - 2 c) - 4 = - 2 (3 c - 1)

\frac{y}{6} - \frac{2}{3} = 3