①x²-5x+ =(x+ )² ②x²+4/3x+ =(x+ )² ③4x²- +25=( )² 求解空白填什么?

问题描述:

①x²-5x+ =(x+ )² ②x²+4/3x+ =(x+ )² ③4x²- +25=( )² 求解空白填什么?
①x²-5x+ =(x+ )² ②x²+4/3x+ =(x+ )² ③4x²- +25=( )²

x²-5x+25/4=(x+5/2)² ②x²+4/3x+4/9=(x+2/3)² ③4x²-20x+25=(2x-5)²