化简求值

显示全部楼层 · 2013-3-31 10:15:03

(3a2-ab)/(9a2-6ab+b2)=a(3a-b)/(3a-b)2=a/(3a-b)当a=4分之3、b=负3分之2时，原式=3/4÷(3×3/4+2/3)
=3/4÷(35/12)
=9/35...

千问 · 2013-3-31 10:15:03

（3a2-ab）/（9a2-6ab+b2）=a(3a-b)/(3a-b)2=a/(3a-b)=(3/4)/(9/4+2/3)=9/35很高兴为您解答，祝你学习进步！【学习宝典】团队为您答题。有不明白的可以追问！如果您认可我的回答。请点击下面的【选为满意回答】按钮，谢谢！...

千问 · 2013-3-31 10:15:03

因为a=3/4,b=-2/3所以(3a2-ab)/(9a2-6ab+b2)=a(3a-b)/(3a-b)2=a/(3a-b)=(3/4)/[3*(3/4)-(-2/3)]=9/35 如果不懂，请追问，祝学习愉快！...

千问 · 2013-3-31 10:15:03

(3a2-ab)/(9a2-6ab+b2)=a(3a-b)/(3a-b)2=a/(3a-b)=(3/4)/(3*3/4-(-2/3))=(3/4)/(9/4+2/3)==(3/4)/(35/12)=9/35...