plz help me to answer the question,if you do not know the answer,plz answer the question.i need the step~Thank for your help!
SIMPLIFY:
1)(6m-12n/-9m-18n)(-12n-6m/6n-3m)
2)[1/(x-2)(x+1)]-[2/(x+1)(x-1)]-[1/(x-2)(x-1)]
3)x^2-xy+3x-3y/2x^2+2xy+6x+6y
easy!!simplify the following (f.2)
2007-10-01 6:23 am
回答 (1)
2007-10-01 6:46 am
✔ 最佳答案
1)(6m-12n/-9m-18n)(-12n-6m/6n-3m)= [6(m-2n)/-9(m+2n)][-6(m+2n)/-3(m-2n)]
= -4/3
= -1.33
2)[1/(x-2)(x+1)]-[2/(x+1)(x-1)]-[1/(x-2)(x-1)]
= [(x-1)-2(x-2)-(x+1)]/[(x-2)(x+1)(x-1)]
= [x-1-2x+4-x-1]/[(x-2)(x+1)(x-1)]
= (2-2x)/[(x-2)(x+1)(x-1)]
= -2(x-1)/[(x-2)(x+1)(x-1)]
= -2/[(x-2)(x+1)]
= 2/[(2-x)(x+1)]
3)x^2-xy+3x-3y/2x^2+2xy+6x+6y
= [x(x+3)-y(x+3)]/2[x(x+3)+y(x+3)]
= [(x-y)(x+3)]/[2(x+y)(x+3)]
= (x-y)/2(x+y)
收錄日期: 2021-04-13 13:41:38
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070930000051KK05489