=(3/4*x-1/2*y)²=9/16*x²-3/4*xy+1/4*y²
=(5/3*c+3/5)²=25/9*c²+2c+9/25=2целых 2/3с+2с+9/25
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=(3/4*x-1/2*y)²=9/16*x²-3/4*xy+1/4*y²
=(5/3*c+3/5)²=25/9*c²+2c+9/25=2целых 2/3с+2с+9/25