a/(b-1)-(a+1)/(b+1)
=a(b+1)/(b+1)(b-1)-(a+1)(b-1)/(b+1)(b-1)
=(ab+a)/(b²-1)-(ab+b-a-1)/(b²-1)
=(ab+a-ab-b+a+1)/(b²-1)
=(2a-b+1)/(b²-1)
猜你喜欢
- 1这个世界上怎么会白昼和黑夜,
- 24分之1:8分之7最简整数比是()比值是()
- 3i think the thife came into the room t_ the window
- 41.There's ( )"a" in the word "map".A.an.B.a C.the 2.There's( )"m" in the word "map".A.an.B.a.C.th
- 5氯化银和硫酸钡不溶于任何酸吗?
- 6136个苹果里面有20个好苹果,随意拿4个苹果是好苹果的概率是多少
- 7城建队要用长5分米,宽3分米的长方形的长方形地砖在广场的中央一个正方形场地.这个正方形的边长最小是
- 8已知a,b,c是三角形ABC的三条边,方程(b+c)x平方+根号2(a-c)x-3/4(a-c)=0有两个相等的实数根,试说明三角形ab
- 9三个连续的奇数之和是45,则这三个数是_.
- 10计算 (x+2)²-(x-1)(x+2) (m-2n+3)(m+2n-3)