分式相关题不改变分式的值,使分子分母都不含负号(1)-2/3x (2)-z/-yz(3)-(-2/-ab) (4)-5-y/-x 2.化简:m²-3m/9-m² a+3/a²-9
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 03:05:11
![分式相关题不改变分式的值,使分子分母都不含负号(1)-2/3x (2)-z/-yz(3)-(-2/-ab) (4)-5-y/-x 2.化简:m²-3m/9-m² a+3/a²-9](/uploads/image/z/1080096-24-6.jpg?t=%E5%88%86%E5%BC%8F%E7%9B%B8%E5%85%B3%E9%A2%98%E4%B8%8D%E6%94%B9%E5%8F%98%E5%88%86%E5%BC%8F%E7%9A%84%E5%80%BC%2C%E4%BD%BF%E5%88%86%E5%AD%90%E5%88%86%E6%AF%8D%E9%83%BD%E4%B8%8D%E5%90%AB%E8%B4%9F%E5%8F%B7%EF%BC%881%EF%BC%89-2%2F3x++++++++++++++++++++%EF%BC%882%EF%BC%89-z%2F-yz%EF%BC%883%EF%BC%89-%EF%BC%88-2%2F-ab%EF%BC%89++++++++%EF%BC%884%EF%BC%89-5-y%2F-x++++2.%E5%8C%96%E7%AE%80%EF%BC%9Am%26%23178%3B-3m%2F9-m%26%23178%3B++++++++++++a%2B3%2Fa%26%23178%3B-9)
分式相关题不改变分式的值,使分子分母都不含负号(1)-2/3x (2)-z/-yz(3)-(-2/-ab) (4)-5-y/-x 2.化简:m²-3m/9-m² a+3/a²-9
分式相关题
不改变分式的值,使分子分母都不含负号
(1)-2/3x (2)-z/-yz
(3)-(-2/-ab) (4)-5-y/-x
2.化简:m²-3m/9-m² a+3/a²-9
分式相关题不改变分式的值,使分子分母都不含负号(1)-2/3x (2)-z/-yz(3)-(-2/-ab) (4)-5-y/-x 2.化简:m²-3m/9-m² a+3/a²-9
1 .-(2/3x )
2.z/yz
3.-(2/ab)
4.( 5 +y)/x
化简:
1.原式=m(m-3)/(3+m)(3-m)
=-[m/(m+3)]
2.原式=(a+3)/(a+3)(a-3)
=1/(a-3)
y=(x²+6x+9)/(x²-9) ÷(x+3)/(x²-3x) -x+3
=(x+3)²/[(x+3)(x-3)] ÷(x+3)/[x(x-3)] -x+3
=(x+3)/(x-3) ×x(x-3)/(x+3) -x+3
=x -x+3
=3
要使分式有意义,分母不能为0,x²-9≠0 且 x²...
全部展开
y=(x²+6x+9)/(x²-9) ÷(x+3)/(x²-3x) -x+3
=(x+3)²/[(x+3)(x-3)] ÷(x+3)/[x(x-3)] -x+3
=(x+3)/(x-3) ×x(x-3)/(x+3) -x+3
=x -x+3
=3
要使分式有意义,分母不能为0,x²-9≠0 且 x²-3x≠0
即x≠±3且x≠0
无论x取使分式有意义的值,y的值不变,都等于3
收起
(1)-2/3x = -(2/3x) (2)-z/-yz=z/yz
(3)-(-2/-ab)= -(2/ab) (4)-5-y/-x=(5+y)/x
2.化简:m²-3m/9-m² =m(m-3).(3+m)(3-m)=-m/(m+3)
a+3/a²-9=(a+3)/(a+3)(a-3)=1/(a-3)
满意求采纳