1)(х-5)×(х+5)=х^2-25 2)(8+у)×(у-8)= -64+у^2 3)(10-к)×(к+10)=100-к^2 4)(a+2/3b)×(a-2/3b)=a^2+4/9b^2 5)(4/9x-y)×(y+4/9x)= -y^2+16/81x^2 6)(4/15n-m)×(m+4/15n)= -m^2+16/225n^2 7)(9x-5y)×(9x+5y)= 81y^2-25y^2 8)(-4a+3b)×(3b+4a)= -16a^2+9b^2 9)(13k-2b)×(2b+13k)= 169k^2-4b^2 10)(5/4c+3/7d)×(3/7d - 5/4c)= -25/16c^2+9/49d^2 11)(1/3x-3y)×(3y+1/3x)= -9y^2+1/9x^2 12)(1/5a+1/9b)×(1/9b - 1/5a)=1/25a^2+1/81b^2
N⁶*(n⁴)³/n¹⁶=n⁶*n¹²/n¹⁶=n¹⁸/n¹⁶=n²
<span><em>СИСТЕМА:
(х-у)/2=14,9 </em>
</span><span><em>y-0,24x=0,6</em>
</span>
<em>х-у=29,8</em>
<span><em>у=0,6+0,24х</em>
</span><em>х-(0,6+0,24х)=29,8</em>
<em>х-0,6-0,24х=29,8</em>
<span><em>0,76х=30,4</em>
</span><em>х=40
</em>
<em>x=40</em>
<span><em>у=0,6+0,24*40</em>
</span>
<em>x=40</em>
<em>y=10,2</em>
<em><u>Ответ: (40; 10,2).</u></em>
Объяснение:
Если х=8, то у=0,5х-1= у=0,5*8-1 = у=3
4^(k+1)=4*4^k........................................