6,7n-3,4n+2,9, если n=0,8.
6,7*0.8-3.4*0.8+2.9=5.36-2.72+2.9=5.54
а) 4,2х+1,7х-1,5х=7,92
4.4x=7.92/4.4
x=1.8
б) у+3,54=8,2;
y=8.2-3.54
y=4.66
в) (у-3,48)+2,15=3,9
y-3.48=3.9-2.15
y-3.48=1.75
y=1.75+3.48
y=5.23
г) (х+2,4):8=2,3;
г) (х+2,4):8-2.3=0
г) (х+2,4)-(2.3*8)/8=0
x+2.4-18.4/8=0
x-16/8=0
x-16=0
x=16
д) (3,5-х)•6=1,2
21-6x=1.2
-6x=1.2-21
-6x=-19.8/(-6)
x=3.3
е) 8х – 3,2=5,6;
8x=5.6+3.2
8x=8.8/8
x=1.1