а. x = 29/4
б. x = 171/14
в. x = 115/9
г. x = 18
д. x = 9/5
Пошаговое объяснение:
a)
9 - x = 7/4- x = 7/4 - 9- x = 29/4x = 29/4б)
x - 12/7 = 21/2x = 21/2 + 12/7x = 171/14в)
11/9 + x = 14x = 14 - 11/9x = 115/9г)
x ÷ 6/5 = 15x × 5/6 = 155/6x = 15x = 18д)
9/4 × 1/x = 5/49/4x = 5/436 = 20x20x = 36x = 9/5