5х-2у-8=0
12х+18-у=41
-у=41-12х-18
5х-2(41-12х-18)-8=0
5х-82+24+36-8=0
5х=82-24-36+8
5х=30
Х=6
Х=6
41-12*6-18
Х=6
<span>У=-49</span>
-28+63=35......................
1) Р = 3/4 * 4 = 12/4 = 3 см
S = 3/4 * 3/4 = 9/16 кв.см
2) Р = 5/6 * 4 = 20/6 = 10/3 = 3 1/3 см
S= 5/6 * 5/6 = 25/36 кв.см
3) Р = 9/10 * 4 = 36/10 = 3 6/10 = 3 3/5 см
S =9/10 * 9/10 = 81/100 кв.см
4) Р = 1 2/3 * 4 = 5/3 * 4 = 20/3 = 6 2/3 см
S = 1 2/3 * 1 2/3 = 5/3 * 5/3 = 25/9 = 2 7/9 кв.см