题目内容
计算题
(1)(-
)-(-3
)+(+2
)-(+5
)
(2)-9×(-11)-12×(-8)
(3)(-
)×(-1
)÷(-2
);
(4)-14-
×[2-(-3)2].
(1)(-
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 2 |
(2)-9×(-11)-12×(-8)
(3)(-
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 4 |
(4)-14-
| 1 |
| 6 |
分析:(1)根据加法结合律进行计算即可;
(2)先算乘法,再算加法;
(3)从左到右依次计算即可;
(4)先算括号里面的,再算乘方,乘法,最后算加减即可.
(2)先算乘法,再算加法;
(3)从左到右依次计算即可;
(4)先算括号里面的,再算乘方,乘法,最后算加减即可.
解答:解:(1)原式=[(-
)-5
]-[(-3
)-2
]
=(-
-
)-(-
-
)
=-6+6
=0;
(2)原式=99+96
=195;
(3)原式=(-
)×(-
)×(-
)
=
×(-
)
=-
;
(4)原式=-1-
×[2-9]
=-1-
×(-7)
=-1+
=
.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
=(-
| 1 |
| 2 |
| 11 |
| 2 |
| 13 |
| 4 |
| 11 |
| 4 |
=-6+6
=0;
(2)原式=99+96
=195;
(3)原式=(-
| 3 |
| 4 |
| 3 |
| 2 |
| 4 |
| 9 |
=
| 9 |
| 8 |
| 4 |
| 9 |
=-
| 1 |
| 2 |
(4)原式=-1-
| 1 |
| 6 |
=-1-
| 1 |
| 6 |
=-1+
| 7 |
| 6 |
=
| 1 |
| 6 |
点评:本题考查的是有理数的混合运算,熟知有理数混合运算的顺序是解答此题的关键.
练习册系列答案
相关题目