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 >

2a+b=30,3b-1=a

解答

2 a + b = 30, 3 b - 1 = a

解答

a = \frac{89}{7}, b = \frac{32}{7}

求解步骤

[2 a + b = 30 3 b - 1 = a]

对于

2 a + b = 30

将

a

移到一边:

a = \frac{30 - b}{2}

替代

a = \frac{30 - b}{2}

[3 b - 1 = \frac{30 - b}{2}]

对于

3 b - 1 = \frac{30 - b}{2}

将

b

移到一边:

b = \frac{32}{7}

对于

a = \frac{30 - b}{2}

替代

b = \frac{32}{7}

a = \frac{30 - \frac{32}{7}}{2}

\frac{30 - \frac{32}{7}}{2} = \frac{89}{7}

a = \frac{89}{7}

方程组的解为:

a = \frac{89}{7}, b = \frac{32}{7}

作图

流行的例子

(125^x)/((5^y))=25,2^{3x}*(1/8)^{1-y}=32

\frac{12 5 ^{x}}{( 5 ^{y} )} = 25, 2^{3 x} \cdot (\frac{1}{8})^{1 - y} = 32

(41)/x-1/((y-2))=-1, 4/x+3/((y-2))=5

\frac{41}{x} - \frac{1}{( y - 2 )} = - 1, \frac{4}{x} + \frac{3}{( y - 2 )} = 5

x + y = 7, 2 x + 3 y = 8

- 8 + x + 8 x = 2, y = 2

3x+y+z=1,x+2y-z=1,x+y+2z=17

3 x + y + z = 1, x + 2 y - z = 1, x + y + 2 z = 17