题目内容
计算:
(1)-10-(-16):+(-24);
(2)
×(-
)×
÷
;
(3)-199
×14;
(4)17×3
-
×(-3
)+2
×
(要求用简便计算).
(1)-10-(-16):+(-24);
(2)
7 |
6 |
1 |
5 |
3 |
14 |
3 |
5 |
(3)-199
5 |
7 |
(4)17×3
1 |
5 |
5 |
6 |
1 |
5 |
1 |
6 |
16 |
5 |
分析:(1)先去括号,再把负数相加,然后进行加法运算;
(2)先把除法化为乘法,然后约分即可;
(3)先变形得到原式=-(200-
)×14,再进行乘法运算,然后进行加法运算;
(4)先变形得到原式=17×
+
×
+
×
,然后利用乘法的分配律计算.
(2)先把除法化为乘法,然后约分即可;
(3)先变形得到原式=-(200-
2 |
7 |
(4)先变形得到原式=17×
16 |
5 |
5 |
6 |
16 |
5 |
13 |
6 |
16 |
5 |
解答:解:(1)原式=-10+16-24=-34+16=-18;
(2)原式=
×(-
)×
×
=-
;
(3)原式=-(200-
)×14
=-2800+4
=-2796;
(4)原式=17×
+
×
+
×
=(17+
+
)×
=20×
=64.
(2)原式=
7 |
6 |
1 |
5 |
3 |
14 |
5 |
3 |
1 |
12 |
(3)原式=-(200-
2 |
7 |
=-2800+4
=-2796;
(4)原式=17×
16 |
5 |
5 |
6 |
16 |
5 |
13 |
6 |
16 |
5 |
=(17+
5 |
6 |
13 |
6 |
16 |
5 |
=20×
16 |
5 |
=64.
点评:本题考查了有理数的运算:先算乘方,再算乘除,然后进行加减运算;有括号先算括号.
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