9(x+y)^2-6(x+y)+1进行因式分解
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9(x+y)^2-6(x+y)+1进行因式分解
9(x+y)^2-6(x+y)+1进行因式分解
9(x+y)^2-6(x+y)+1进行因式分解
9(x+y)^2-6(x+y)+1
=【3(x+y)-1】²
9(x+y)^2-6(x+y)+1
=(3x+3y-1)^2
=(3x+3y-1)(3x+3y-1)
9(x+y)²-6(x+y)+1
=[3(x+y)-1]²
=(3x+3y-1)²
原式 = (3(x+y))² -2 * 3(x+y) * 1 +1
=(3(x+y)+1)²
=(3x+3y+1)²
[3(x+y)-1]^2
[3(x+y)-1]^2
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