题目
题型:解答题难度:一般来源:不详
(1)(-2)2×
12 |
3 |
3 |
8 | ||
2-
|
(2)已知x=
1 | ||
|
| ||
x2-x |
1-2x+x2 |
x-1 |
(3)2sin30°+cos60°-tan60°-tan30°+cos245°.
答案
3 |
3 |
3 |
3 |
3 |
3 |
(2)∵x=
1 | ||
|
∴原式=
| ||
x(x-1) |
(x-1)2 |
x-1 |
1-x |
x(x-1) |
1 |
x |
3 |
1 | ||
|
3 |
| ||
3 |
4
| ||
3 |
(3)原式=2×
1 |
2 |
1 |
2 |
3 |
| ||
3 |
| ||
2 |
核心考点
试题【计算:(1)(-2)2×12-43(4-3)+82-3(2)已知x=13,求x2 -2x+1x2-x-1-2x+x2x-1的值.(3)2sin30°+cos60】;主要考察你对最简二次根式等知识点的理解。[详细]
举一反三
对于题目“化简并求值: