последнее,там полный квадрат
1-d²+2dc-c²=1-(d²-2dc+c²)=1-(d-c)²=(1-d+c)(1+d-c)
OTBET: 5
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последнее,там полный квадрат
1-d²+2dc-c²=1-(d²-2dc+c²)=1-(d-c)²=(1-d+c)(1+d-c)
OTBET: 5