9(x+y)^2-6(x+y)+1因式分解
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9(x+y)^2-6(x+y)+1因式分解9(x+y)^2-6(x+y)+1因式分解9(x+y)^2-6(x+y)+1因式分解9(x+y)^2-6(x+y)+1=[3(x+y)]^2-2*3(x+y)
9(x+y)^2-6(x+y)+1因式分解
9(x+y)^2-6(x+y)+1因式分解
9(x+y)^2-6(x+y)+1因式分解
9(x+y)^2-6(x+y)+1
=[3(x+y)]^2-2*3(x+y)+1
=[3(x+y)-1]^2
=(3x+3y-1)^2
=[3（x+y)-1]^2
十字相乘法
9(x+y)^2-6(x+y)+1
把x+y看做一项
=[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
令x+y=m
9(x+y)^2-6(x+y)+1=9m^2-6m+1=(3m-1)^2=(3x+3y-1)^2
令x+y=m 把x+y看做一项
9(x+y)^2-6(x+y)+1=9m^2-6m+1=(3m-1)^2=(3x+3y-1)^2
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