1) 2*2*18=72 (м^2) - S тюков 2x2.
2) 3*4=12 (м^2) - S тюков 3х4.
3) 72:12=6.
Ответ: 6.
<em><u>8 4\5 + 1 1\3 = 8 12\15 + 1 5\15 = 9 17\15 = </u></em>10 2\15
<em><u>12 5\6 + 4\5 = 12 25\30 + 24\30 = 12 49\30</u></em> = 13 19\30
<em><u>2 3\4 + 1 2\3 = 2 9\12 + 1 8\12 = 3 17\12 =</u></em> 4 5\12
X + 1/2 = 6
x + 1 = 12
x = 11
x^2 + 1/x^2 = 121+1/121 = 122/121 = 1 целая 1/121