2的x-3次方=1/2=2^(-1)
则x-3=-1
x=2
x²-x的负平方/x+x的-1次方
=(x+1/x)(x-1/x)/(x+1/x)
=x-1/x
=2-1/2
=3/2
已知2的x-3次方=1/2,求x²-x的负平方/x+x的-1次方的值
已知2的x-3次方=1/2,求x²-x的负平方/x+x的-1次方的值
数学人气：942 ℃时间：2019-08-20 15:30:57
优质解答
我来回答
类似推荐
猜你喜欢
- 1what are you going to do in the coming v_______ To fly to taiwan
- 2食堂大米比面粉多六分之五,正好多600千克,食堂运来面粉多少千克
- 3需要一句名言,最好是古诗词.
- 4英语过去时态——过去式
- 5已知函数f(x)=2x-a的绝对值+a 若不等式f(x)小于等于6的解集为-2
- 6There()a football match next Tuesday Ais going to have B is going to Cis going to be
- 7一,求下列函数的导数,并指出函数的单调区间 （1）y=3x^4-4x^3-12x^2+18 (2)y=(x+1)(x^2-1)
- 8有理数的混合运算法则
- 9当主语是多个从句或动名词时,谓语动词应用单数还是复数
- 10Would you like to help us?----Yes,_____.A.I would B.I do C.I'd like DI'd love to