黄兰香到怀化:一道数学解方程题,12分钟内选出最佳答案!
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X的平方-mx-nx+mn=0(m,n为常数)
希望说出过程~~
希望说出过程~~
x^2 - (m + n)x + mn
= (x - m)*(x -n)
= 0
x = m,n
x=m,n
x^2 - (m + n)x + mn
= (x - m)*(x -n)
= 0
x = m,n
x^2 - (m + n)x + mn
= (x - m)*(x -n)
= 0
x = m,n
x=m,n
x^2 - (m + n)x + mn
= (x - m)*(x -n)
= 0
x = m,n