Найдите неизвестное число: 1) 1 1/2 + х = 3/4 2) 2 3/4 - х = 7/2 3) х + 1 1/8 = 2 1/2

Question

Найдите неизвестное число: 1) 1 1/2 + х = 3/4 2) 2 3/4 - х = 7/2 3) х + 1 1/8 = 2 1/2

Answer 1

1) 3/2 + х = 3/4
6/4 + х = 3/4
х = 3/4 - 6/4
х = -3/4 = -0,75
2) 11/4 - х = 7/2
11/4 - х = 14/4
-х = 14/4 - 11/4
-х = 3/4
х = -3/4 = -0,75
3) х + 1 1/8 = 2 1/2
х + 9/8 = 5/2
х + 9/8 = 20/8
х = 20/8 - 9/8
х = 11/8 = 1 3/8 = 1,375