1.x²+4x+____=(x+___)² 2.x²-5x+____=(x-____)² 3.x²______+9=(x____)
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![1.x²+4x+____=(x+___)² 2.x²-5x+____=(x-____)² 3.x²______+9=(x____)](/uploads/image/z/1334003-59-3.jpg?t=1.x%26sup2%3B%2B4x%2B____%3D%EF%BC%88x%2B___%EF%BC%89%26sup2%3B+2.x%26sup2%3B-5x%2B____%3D%EF%BC%88x-____%EF%BC%89%26sup2%3B+3.x%26sup2%3B______%2B9%3D%EF%BC%88x____%EF%BC%89)
1.x²+4x+____=(x+___)² 2.x²-5x+____=(x-____)² 3.x²______+9=(x____)
1.x²+4x+____=(x+___)² 2.x²-5x+____=(x-____)² 3.x²______+9=(x____)
1.x²+4x+____=(x+___)² 2.x²-5x+____=(x-____)² 3.x²______+9=(x____)
1,x²+4x+4=(x+2)²
2,x²-5x+25/4=(x-5/2)²
3,x²±6x+9=(x±3)²