Дополните до квадрата суммы или разности:

а)  a^2 - 2ab + ____= 
б)k^2 - 8kl+____=
в)x^2 +7xy + _____=
г)x^2+y^2 + _____=
д)x^2+4-_____=
е) x^2+4a^2+____=

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