作业帮填空：x²+4x+____ =(x+____)²x²-5x+____ =(x-____)²x²_____+9=(x____)²
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填空：x²+4x+____ =(x+____)²x²-5x+____ =(x-____)²x²_____+9=(x____)²
填空：x²+4x+____ =(x+____)²
x²-5x+____ =(x-____)²
x²_____+9=(x____)²
填空：x²+4x+____ =(x+____)²x²-5x+____ =(x-____)²x²_____+9=(x____)²
4 2
6.25 2.5
+6x +3
4 2
25/4 5/2
-6x -3 或 6x 3
x²+4x+【4】 =(x+【2】)²
x²-5x+【6.25】 =(x－【2.5】)²
x²【±6x】+9=(x【±3】)²