Solve the following equation (1) 40 × 12.5 = (40-x) × 20% (2) 3x (x + 1) - 1 / 3 (x-1) - 1 / 2 (x + 1)

Solve the following equation (1) 40 × 12.5 = (40-x) × 20% (2) 3x (x + 1) - 1 / 3 (x-1) - 1 / 2 (x + 1)

(1) 40 × 12.5 = (40-x) × 20% 500 = 1 / 5 (40-x) 2500 = 40-x x x = 2500-40 x = 2460 (2) 3x (x + 1) - 1 / 3 (x-1) - 1 / 2 (x + 1) where is the equal sign

How to solve the equation 2x = x + X / 2 + X / 3 + 18

If 2x = x + X / 2 + X / 3 + 182x = 11 / 6x + 181 / 6x = 18x = 108, then 18 = 2x-x-x / 2-x / 3 = x / 6, then x = 18x6 = 108 (people) go 50% before going to bed, the rest is 50% before going to bed, and the rest is 50% X80% = 40%! (remember to adopt ha!)

(x + 3) * y = 12 x * (y + 2) = 18 bivariate quadratic equation solution~
One variable quadratic equation, wrong number.

It can be seen that XY + 3Y = 18, XY + 2x = 1.5 by subtracting the two formulas, we can get 3y-2x = 16.5, that is, y = 5.5 + 2x / 3. Take it into the equation XY + 3Y = 18 to get the quadratic equation of one variable, and then solve it