решите уравнение
4\5 = 0,2х+3\6,5

(4/5)=0,2х+(3/6,5)(4/5)-(3/6,5)=0,2х|3÷6,5=3÷(65/10)=(3×10)/65=(30/65)|(4/5)-(30/65)=0,2х0,2х=(4×13-30)/650,2х=(52-30)/650,2х=(22/65)(2/10)х=(22/65)|÷(2/10)(2/10)х÷(2/10)=(22/65)÷(2/10)(2/10)х×(10/2)=(11×2)/(13×5)×(2×5)/2х=(11×2×2×5)/(13×5×2)х=(22/13)х=1(9/13)Проверка:(4/5)=0,2×(22/13)+(3/6,5)(4/5)=(2/10)×(22/13)+(30/65)(4/5)=(44/130)+(30/65)(4/5)=(44+30×2)/130(4/5)=104/130=(4×26)/(5×26)(4/5)=(4/5)- истина.