a) (x+2,3)*0,2=0,7 б) (2,8-х):0,3=5 в) 4,2х+8,4=14,7 г) 0,39:х-0,1=0,16
А) (x+2.3)*0.2=0.7 0.2x+0.46=0.7 0.2x=0.7-0.46 0.2x=0.322 |/0.2 x=1.61 б) (2.8-x)/0.3=5 |*0.3 2.8-x=1.5 -x=1.5-2.8 -x=-1.3 |/(-1) x=1.3 в) 4.2x+8.4=14.7 4.2x=14.7-8.4 4.2x=6.3 |/4.2 x=1.5 г) 0.39/x-0.1=0.16 |*x 0.39-0.1x=0.16x -0.1x-0.16x=-0.39 -0.26x=-0.39 |/(-0.26) x=1.5