配方计算:1/2x²-( )x+9/2=1/2(x-( ))²坐等

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配方计算:1/2x²-()x+9/2=1/2(x-())²坐等配方计算:1/2x²-()x+9/2=1/2(x-())²坐等配方计算:1/2x²-()

配方计算:1/2x²-( )x+9/2=1/2(x-( ))²坐等
配方计算:1/2x²-( )x+9/2=1/2(x-( ))²
坐等

配方计算:1/2x²-( )x+9/2=1/2(x-( ))²坐等
1/2x²-( 3)x+9/2=1/2(x-(3 ))²,
需要解释吗?