(x+2)+(x-3)+(x-7)+(x+4)=360

解答

(x + 2) + (x - 3) + (x - 7) + (x + 4) = 360

x = 91

求解步骤

(x + 2) + (x - 3) + (x - 7) + (x + 4) = 360

去除括号:

(a) = a

x + 2 + x - 3 + x - 7 + x + 4 = 360

对同类项分组

x + x + x + x + 2 - 3 - 7 + 4 = 360

(x - 3) + (4 x - 6) + (2 x + 3) + (3 x - 4) = 360

so l v e f or a, p = \frac{a}{b}

so l v e f or x, 6 y = 4 x - 2

so l v e f or x, 2 y = 4 x

so l v e f or x, y - \frac{1}{3} x = 0