1-1.24n+1.44n^2=(1-1.2n)^2
4x^2+5.2xy+1.69y^2=(2x+1.3y)^2
<span>81a^2+23,4a+1,69=(9a+1.3)^2
</span><span>36a^2−22,8a+3,61=(6a+1.9)^2
</span><span>49−182n+169n^2=(7-13n)^2</span>
<span>( х+36,1)*5,1=245,82</span>
4х-3у=2
у=1-2х
4х-3 (1-2х)=2
у=1-2у
4х-3+6х=2
у=1-2у
10х=2+3
у=1-2у
10х=5
у=1 -2х
х=5:10
у=1-2у
х=0,5
у=1-2×0,5
у=0,5
х=0