решите
уравнение
(2,61-4z):0,03+4,6=90

(2,61-4z):0,03=90-4,6(2,61-4z):0,03=85,42,61-4z=85,4*0,032,61-4z=2,5624z=2,61-2,5624z=0,048z=0,048:4z=0,012

(2,61-4z):0,03=90-4,6(2,61-4z):0,03=85,4(2,61-4z)=85,4*0,032,61-4z=2,5622,61-2,562=4z0.048=4zz=0,048/4z=0,012