1)1/5x + 4 = 2 1/3 2) 5 1/6 : x= 0 3)x квадрат + 16=0
1)1/5x + 4 = 2 1/3
1/5x =2 1/3-4
1/5x =2.1/3-3.3/3
1/5x =-1.2/3
x=-15/3 : 1/5
x=-15/3*5
x=-25