(m的平方-9分之m-15)-(3-m分之3)
问题描述:
(m的平方-9分之m-15)-(3-m分之3)
答
(m的平方-9分之m-15)-(3-m分之3)
=(m-15)/(m²-9)-3/(3-m)
=(m-15+3(m+3))/(m²-9)
=(4m-6)/(m²-9);
=2(2m-3)/(m²-9);
如果本题有什么不明白可以追问,(x的平方-2x分之x+2)-(x的平方-4x+4分之x-1)这题怎么做?(x的平方-2x分之x+2)-(x的平方-4x+4分之x-1)=(x+2)/(x²-2x)-(x-1)/(x²-4x+4)=(x+2)/(x(x-2))-(x-1)/(x-2)²=((x+2)(x-2)-x(x-1))/(x(x-2)²)=(x-4)/(x(x-2)²)