( )²=x²-½x+___

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()²=x²-½x+___()²=x²-½x+___()²=x²-½x+___(x-1/4)²=x&

( )²=x²-½x+___
( )²=x²-½x+___

( )²=x²-½x+___

(x-1/4)²=x²-½x+1/16

(x-1/40)^2=.....+1/16