观察下列各式,1⼀1*2=1-1⼀2 1⼀2*3=1⼀2-1⼀3,1⼀3*4=1⼀3-1⼀4

用上列变化规律解方程1/(x(x-1))+1/((x-1)(x-2))+.......+1/((x-9)(x-10))=5/12
2024-11-25 14:20:43
推荐回答(6个)
回答1:

化简成1/(x-1)-1/x+1/(x-2)-1/(x-1)+…+1/(x-10)-1/(x-9)=5/12
1/(x-10)-1/x=5/12
10/(x(x-10))=5/12
x=12

回答2:

那下面全化成上面形式 最后x=?咦题目不对啊

回答3:

1/(x(x-1))=1/(x-1) -1/x,拆项相销可得方程为1/(x-10)-1/x=10/(x(x-10))=5/12.解得x=12或-2

回答4:

同样的都裂开,得1/(x-10)-1/x=5/12,解得x=12。

回答5:

回答6:

左式=1/x-1/(x-1)+1/(x-1)-1/(x-2)+……+1/(x-9)-1/(x-10)=1/x-1/(x-10),这样就变成了一元二次方程。