题目
题型:解答题难度:一般来源:不详
(1)(-
3 |
7 |
1 |
3 |
9 |
14 |
1 |
42 |
(2)-14-(1-0.5)×
1 |
3 |
(3)|-5-4|-(-5)×(-2)2-1÷(-3)
(4)(-2x2+3x)-[5x-(2x2+1)-x2].
答案
3 |
7 |
1 |
3 |
9 |
14 |
1 |
42 |
=(-
3 |
7 |
1 |
3 |
9 |
14 |
=18-14+27,
=31;
(2)-14-(1-0.5)×
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=-1+
7 |
6 |
=
1 |
6 |
(3)|-5-4|-(-5)×(-2)2-1÷(-3),
=9-(-5)×4-(-3),
=9+20+3,
=32;
(4)(-2x2+3x)-[5x-(2x2+1)-x2],
=-2x2+3x-5x+2x2+1+x2,
=x2-2x+1.
核心考点
试题【计算:(1)(-37+13-914)÷(-142)(2)-14-(1-0.5)×13×[2-(-3)2](3)|-5-4|-(-5)×(-2)2-1÷(-3)(】;主要考察你对有理数的混合运算等知识点的理解。[详细]
举一反三
1 |
2 |
1 |
3 |
1 |
4 |
1 |
10 |
100! |
98! |
A.15% | B.20% | C.25% | D.30% |
. |
| . |
. |
| . |
. |
| . |
按照这种运算的规定:请解答下列各个问题:
①
. |
| . |
②求x的值,使
. |
| . |