Question

Решите пожалуйста уравнения поэтапно! 1)3х+5х=7 2)1=6х-2х+х 3)7 1/4х-х=9 3/8 4)1:2 7/9=х+4 2/5х 5)(4 1/5:х+1 1/3):2 4/35:4/5=1 8/15 6)4 1/5:1 1/5=2 3/4*4-1 7/18 Помогите пж срочно кто какой может!

Answer 1

3х+5х=7 8х=7 х=7/8 1=6х-2х+х 1=5х х=5/1 х=5

Answer 2

1) 3x + 5x = 7 8x = 7 x = 7/8

2) 1 = 6x - 2x + x 1 = 5x x = 1/5

3) 7 + 1/4x - x = 9 + 3/8 7 - 9 = x - 1/4x + x -2 = 3/4x x = -8/3

4) 1/2 + 7/9 = x + 4 + 2/5x 5/10 + 70/90 = 9/10x + 40/10 + 4/10x 17/18 = 13/10x + 40/10 17/18 - 40/10 = 13/10x -193/90 = 13/10x x = -193/117

5) (4 + 1/5) / (x + 1 + 1/3) = 2 + 3/4 * 4 - 1 + 7/18 (21/5) / (x + 4/3) = 2 + 12/4 - 1 + 7/18 (21/5) / (x + 4/3) = 2 + 3 - 1 + 7/18 (21/5) / (x + 4/3) = 4 + 7/18 (21/5) / (x + 4/3) = 75/18 + 7/18 (21/5) / (x + 4/3) = 82/18 (21/5) * (3/4) = 82/18 * (x + 4/3) 63/20 = (82/18) * (x + 4/3) 63/20 = (82/18) * (3x + 4)/3 63/20 = (82/18) * (3x + 4)/3 63/20 = (82(3x + 4))/(18 * 3) 63/20 = (82(3x + 4))/(54) 63/20 = (246x + 328)/54 63/20 * 54 = 246x + 328 63/20 * 54 - 328 = 246x -67.8 = 246x x = -67.8/246 x = -0.275

6) 4 + 1/5:1 + 1/5 = 2 + 3/4 * 4 - 1 + 7/18 4 + 1/5 - 1 + 1/5 = 2 + 12/4 - 1 + 7/18 4 - 1 = 2 + 3 - 1 + 7/18 3 = 2 + 3 - 1 + 7/18 3 = 6 + 7/18 3 - 6 = 7/18 -3 = 7/18 This equation has no solution.