题目内容
计算:
(1)-(-9)+(-6)+(-3)
(2)0-(-5)-(+6)
(3)-|-3
|-(-2
)
(4)(+1
)-(-1
)
(5)(-3
)-(+2
)
(6)-4-(-4
)
(7)(+2
)-(+4
)-(-2
)
(8)(-
)-(-1
)-(-2
)-(+3
).
(1)-(-9)+(-6)+(-3)
(2)0-(-5)-(+6)
(3)-|-3
| 3 |
| 4 |
| 1 |
| 4 |
(4)(+1
| 2 |
| 3 |
| 1 |
| 3 |
(5)(-3
| 1 |
| 4 |
| 1 |
| 2 |
(6)-4-(-4
| 1 |
| 4 |
(7)(+2
| 3 |
| 7 |
| 3 |
| 14 |
| 3 |
| 14 |
(8)(-
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 4 |
分析:(1)(2)根据有理数的减法进行计算即可得解;
(3)先去掉绝对值号,再根据有理数的减法运算法则进行计算即可得解;
(4)(5)(6)根据有理数的减法运算法则进行计算即可得解;
(7)把同分母分数相加减,然后进行计算即可得解;
(8)把同分母分数相加减,然后进行计算即可得解.
(3)先去掉绝对值号,再根据有理数的减法运算法则进行计算即可得解;
(4)(5)(6)根据有理数的减法运算法则进行计算即可得解;
(7)把同分母分数相加减,然后进行计算即可得解;
(8)把同分母分数相加减,然后进行计算即可得解.
解答:解:(1)-(-9)+(-6)+(-3)
=9-6-3
=0;
(2)0-(-5)-(+6)
=0+5-6
=-1;
(3)-|-3
|-(-2
)
=-3
+2
=-
;
(4)(+1
)-(-1
)
=1
+1
=3;
(5)(-3
)-(+2
)
=-3
-2
=-5
;
(6)-4-(-4
)
=-4+4
=
;
(7)(+2
)-(+4
)-(-2
)
=2
-4
+2
=2
-2
=
;
(8)(-
)-(-1
)-(-2
)-(+3
)
=-
+1
+2
-3
=-
+2
+1
-3
=2-2
=0.
=9-6-3
=0;
(2)0-(-5)-(+6)
=0+5-6
=-1;
(3)-|-3
| 3 |
| 4 |
| 1 |
| 4 |
=-3
| 3 |
| 4 |
| 1 |
| 4 |
=-
| 3 |
| 2 |
(4)(+1
| 2 |
| 3 |
| 1 |
| 3 |
=1
| 2 |
| 3 |
| 1 |
| 3 |
=3;
(5)(-3
| 1 |
| 4 |
| 1 |
| 2 |
=-3
| 1 |
| 4 |
| 1 |
| 2 |
=-5
| 3 |
| 4 |
(6)-4-(-4
| 1 |
| 4 |
=-4+4
| 1 |
| 4 |
=
| 1 |
| 4 |
(7)(+2
| 3 |
| 7 |
| 3 |
| 14 |
| 3 |
| 14 |
=2
| 3 |
| 7 |
| 3 |
| 14 |
| 3 |
| 14 |
=2
| 3 |
| 7 |
=
| 3 |
| 7 |
(8)(-
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 4 |
=-
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 4 |
=-
| 2 |
| 3 |
| 2 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
=2-2
=0.
点评:本题考查了有理数的减法,有理数的加法,熟记运算法则是解题的关键,利用运算定律可以使计算更加简便.
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