标上题号,Thanks!
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标上题号,Thanks!标上题号,Thanks! 标上题号,Thanks!12:=(m-3n+3m-2n)(m-3n-3m+2n)=(5n-4m)(2m+n)14:=
标上题号,Thanks!
标上题号,Thanks!
标上题号,Thanks!
12:=(m-3n+3m-2n)(m-3n-3m+2n)=(5n-4m)(2m+n) 14:=-(x^2-4x+4)=-(x-2)^2