1) 1,1x - 2 1/2 = 3/5x
1,1x - 3/5x = 2 1/2
1,1x - 0,6x = 2 1/2
0,5x = 2 1/2
0,5x = 2,5
x = 2,5 : 0,5
x = 5
2) 6,75x = 2 1/4x - 9
6,75x - 2 1/4x = -9
6,75x - 2,25x = -9
4,5x = -9
x = -9 : 4,5
x = -2
Пошаговое объяснение:
1) 1,1x - 2 1/2 = 3/5x
1,1x - 3/5x = 2 1/2
1,1x - 0,6x = 2 1/2
0,5x = 2 1/2
0,5x = 2,5
x = 2,5 : 0,5
x = 5
2) 6,75x = 2 1/4x - 9
6,75x - 2 1/4x = -9
6,75x - 2,25x = -9
4,5x = -9
x = -9 : 4,5
x = -2
Пошаговое объяснение: