Question

380 буква б)в) 7 класс

Answer 1

1/5x+11=1-3/5x
1/5x+3/5x=1-11
4/5x=-10
x=-10/1:4/5
x=-10/1×5/4
x=-50/4
x=-12.5

8-1/4z=1
-1/4z=1-8
-1/4z=-7
z=1/4:7/1
z=1/4×1/7
z=1/28