(1)|根号3-根号5|+|根号5-根号7| (2)根号-8的三次方+5根号27的三次方-8根号16分之1(3)根号3(根号3-3)求答案!
问题描述:
(1)|根号3-根号5|+|根号5-根号7| (2)根号-8的三次方+5根号27的三次方-8根号16分之1
(3)根号3(根号3-3)求答案!
答
(1)|√3-√5|+|√5-√7| =√5-√3+√7-√5=√7-√3
(2)√(-8)³+5√27³-8√(1/16)=16√2i+5×27×3√3-8×1/4=16√2i+405√3-2
3)√3×(√3-3)=3-3√3
答
(1)因为:(1)根号3小于根号5;根号5小于根号7|
|根号3-根号5|+|根号5-根号7| =根号5-根号3+根号7-根号5
| =根号7-根号3
(2)根号-8开三次方+5倍根号27开三次方-8根号16分之1
=-2+5*3-8*1/4
=-2+15-2
=11
答
(1)|根号3-根号5|+|根号5-根号7|
=√5-√3+√7-√5
=√7-√3
(2)根号-8的三次方+5根号27的三次方-8根号16分之1
=-2+15-2
=11
(3)根号3(根号3-3)
=3-3√3
答
(1)|根号3-根号5|+|根号5-根号7|
=根号5-根号3+根号7-根号5
=根号7-根号3
(2)根号-8的三次方+5根号27的三次方-8根号16分之1
根号-8的三次方 有问题
(3)根号3(根号3-3)
=3-根号3