- 试题详情及答案解析
- .计算:(每题4分共24分)
(1)
(2)
(3)
(4)
(5)
(6)- 答案:(1)20 (2)-148 (3)-3a-11 (4)-13m+22n (5) 81 (6)
- 试题分析(1)有理数的加减,注意算式中的相反数之和为0;(2)运算中注意运算顺序;
(3)(4)先去括号再合并同类型进行化简;
(5)把除法转化为乘法后,运用分配律进行简便计算;
(6)先算乘方再进行有理数运算.
试题解析:
(1)
=22+(-2)+(-2014)+2014
=20
(2)
=21-169
=-148
(3)
="a" 2—6a-7-a2+3a-4
=" a" 2-a2-6a+3a-7-4
=-3a-11
(4)
=5m+5n-12m+8n-6m+9n
=5m-12m-6m+5n+8n+9n
=-13m+22n
(5)
=×(-36)-3×(-36)+×(-36)-×(-36)
=-18+108-30+21
="81"
(6)
=4×[(-9)×-0.8]×(-)
= 4×[-1-0.8]×(-)
=
考点:整式的加减,有理数运算.