Question

2х = 18 -х7х +3=30-2×0.2х + 2.7= 1.4 - 1.1х​

Answer 1

Ответ:

1) 2x+x=18

3x=18, x=6

2)7x+2x=30-3

9x=27

x=3

3)0,2x+1,1x=1.4-2.7

1,3x=-1,3

x=-1

Answer 2

To solve the given equations, let's simplify each equation step by step:

Equation 1: 2x = 18 - 7x Rearranging the equation by moving all the x terms to one side: 2x + 7x = 18 Combining like terms: 9x = 18 Dividing both sides by 9: x = 18/9 x = 2

Equation 2: 30 - 2×0.2x + 2.7 = 1.4 - 1.1x Simplifying the equation by performing the calculations: 30 - 0.4x + 2.7 = 1.4 - 1.1x Combining like terms: 32.7 - 0.4x = 1.4 - 1.1x Adding 1.1x to both sides and subtracting 1.4 from both sides: 32.7 + 1.1x - 1.1x = 1.4 - 1.1x + 1.1x Simplifying: 32.7 = 1.4 Since the equation is contradictory (32.7 does not equal 1.4), there is no solution to this equation.

Therefore, the solution to the first equation is x = 2, and the second equation has no solution.