填上适当的数,使下列等式成立:
(1)x2+2x+________=(x+______)2;(2)x2-6x+________=(x-______)2;
(3)t2-10t+________=(t-______)2;(4)y2+_____y+121=(y+_______)2.
填上适当的数,使下列等式成立:
(1)x2+2x+________=(x+______)2;(2)x2-6x+________=(x-______)2;
(3)t2-10t+________=(t-______)2;(4)y2+_____y+121=(y+_______)2.