1)(7a-1)ˇ2+14a=49aˇ2-14a+1+14a=49aˇ2+1
12ab+(6a-b)ˇ2=12ab+36aˇ2-12ab+bˇ2=36aˇ2+bˇ2
(3a-b)ˇ2-9aˇ2=9aˇ2-6ab+bˇ2-9aˇ2=bˇ2-6ab
4xˇ2-(2x+1)ˇ2=4xˇ2-4xˇ2-4x-1=-4x-1
2)(5a-1)ˇ2+10a=25aˇ2-10a+1+10a=25aˇ2+1
(4+7x)ˇ2-56x=16+56x+49xˇ2-56x=49xˇ2+16
6ab+(3a-2b)ˇ2=6ab+9aˇ2-12ab+4bˇ2=9aˇ2-6ab+4bˇ2
49xˇ2-(2-7x)ˇ2=49xˇ2-4+28x-49xˇ2=28x-4
x^{2} +2x≥0
x(x+2)≥0
x≥0 x≥-2
(-R;-2)(0:R)
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<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>