Пошаговое объяснение:
1)
77-(28+у)=37
77 - 28 - y = 37
49 - y = 37
y = 49 - 37
y = 12
2)
6х+40=70
6x = 70 - 40
6x = 30
x = 30 : 6
x = 5
3)
46+у:5=85
y : 5 = 85 - 46
y : 5 = 39
y = 39 * 5
y = 195
4)
49+(136-х*8):4=81
(136 - 8x):4 = 81 - 49
(136 - 8x):4 = 32
136 - 8x = 32*4
136 - 8x = 128
8x = 136 - 128
8x = 8
x = 8 : 8
x = 1
1)77-(28+у)=37
77 -28 -y = 37
49-y =37
-y = 37-49
-y = -12
y = 12
2)6х+40=70
6x = 70 - 40
6x = 30
x = 30:6
x = 5
3) 46+у:5=85
y:5 = 85-46
y:5 = 39
y = 39*5
y = 195
4)49+(136-х*8):4=81
49 + 34 - 2x = 81
83 -2x = 81
-2x = 81-83
-2x = -2
x = -2:(-2)
x = 1