1) 5²+2*5*m+m²=25+10m+m²
2)(2c)²-2*2c*d+d²=4c²-4cd+d²
3)(3p)²+2*3p*4k+(4k)²=9p²+24pk+16k²
4)(6a+5x)²=(6a)²+2*6a*5x+25x²=36a²+60kx+25x²
5)(5y-4x)²=25y²-2*5y*4x+(4x)²=25y²-40yx+16x²
<span>3х-2у=4 -9-15y-2y=4 13y=13 y=1</span><span>х-5у=-3 x=-3+5y x=-3+5y x=2</span>
А- 4
Б -3
В-1 !!!!!!!!!!!!!!!!!