(_+4y)²=1/4x²+_+_______

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(_____+4y)²=1/4x²+_______+_________(_____+4y)²=1/4x²+_______+_________(_____+4y)

(_____+4y)²=1/4x²+_______+_________
(_____+4y)²=1/4x²+_______+_________

(_____+4y)²=1/4x²+_______+_________
(__1/2x___+4y)²=1/4x²+__4y/x_____+___16y²______

(1/2x+4y)²=1/4x²+4y/x+16y² 望采纳