n/m=2,则（m²+3mn-n²）/（m²+mn+2n²）的值是
人气：451 ℃ 时间：2019-12-10 19:32:21
解答
即n=2m
所以n²=4m²
mn=2m²
所以原式=(m²+6m²-4m²)/(m²+2m²+8m²)
=3m²/11m²
=3/11
推荐
猜你喜欢
- 连词成句:doesn't,how,the,stop,Mr Li,get,know,to,bus,to(.)
- 乙醇跟浓硫酸共热到底如何能产生乙醚
- 雷电的能量到底有多大
- 分式方程：x平方+2x分之3-x平方-2x分之1=0
- Gao hong,__is this?This is a __of my family.Are these your parents?Yes,___are.My father is 40,
- 滑轮是杠杆的变形,属于杠杆类机械是对还是错
- 平面内若有一条直线,最多可将平面分成几部分?若有两条直线,三条直线呢?总结以上规律 若有n条直线...
- Today the forest shave almost gone.People must _______ too many trees.
