Question

решите уравнение пж:
Z - 4/9*Z=4.5

Answer 1

z-4/9z=4.5
9/9z-4/9z=4.5
5/9x=4.5
x=4.5*9/5
x=8 1/10=8.1

Answer 2

Z - 4/9*Z=4.5
Z - 4/9Z=4.5
9/9z-4/9z=4.5
5/9z=4.5
5/9z=45/10
z=45/10:5/9
z=45/10* 9/5
z=9/2*  9/5
z=81/10
z=8 1/10 или 8,1