化简下列分式1,-2x三次方y/4x方y方=-x乘()/()乘2x方y= 2,a-b/a方-b方= 3,x方+8x+16/x方-16
问题描述:
化简下列分式1,-2x三次方y/4x方y方=-x乘()/()乘2x方y= 2,a-b/a方-b方= 3,x方+8x+16/x方-16
答
1.-2x^3y/4x^2y^2=-x(2x^2y)/(2y)2x^2y
2.a-b/a^2-b^2=a-b/(a+b)(a-b)
3.x^2+8x+16/x^2-16=(x+4)^2/(x+4)(x-4)
答
这些题目都是用提取公因式的方法做的,把相同的提取出来,再消去!
1.-2x^3y/4x^2y^2=-x(2x^2y)/(2y)2x^2y
2.a-b/a^2-b^2=a-b/(a+b)(a-b)
3.x^2+8x+16/x^2-16=(x+4)^2/(x+4)(x-4)