-2 2/3+8-4,2х-12= - 6 2/3-4,2х
при х=3 -6 2/3-4,2*3= - 6 2/3-12 3/5= -6 10/15-12 9/15= -19 4/15
при х= -1 -6 2/3-4,2*(-1)= - 6 2/3+4 1/5= - 6 10/15+4 3/15= - 2 7/15
при х=0 -6 2/3-4,2*0= - 6 2/3
при х=2 -6 2/3-4,2*2= - 6 2/3-8 1/5= - 14 13/15
при х=5 -6 2/3-4,2*5= - 26 2/3
при х=1/2 -6 2/3-4,2*1/2= - 10 23/30
3,
у-4,2у+6,3у*9,3=0
у-4,2у+58,59у=0
55,39у=0
у=0:55,39
у=0
-3.1z-2.7+4.6z+1.2=0.3
1.5z=0.3+2.7-1.2
1.5z=1.8
z=1.8:1.5
z=1,2
4.
13:10*3=3,9
13:13*3=3
5.
(1,722:0,3+2,26):2,4*2,2=7,326
1) 1,722:0,3=5,74
2) 5,74+2,26=8
3) 8:2,4=3,33
4) 3,33*2,2=7,326