早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算题:(1)(-49)-(+91)-(-5)+(-9);(2)(−516)÷(−730)×(−631);(3)1+(-2)+|-2-3|-5;(4)(-5)×(-7)-5×(-6);(5)(512+23−34)×(−12);(6)-7×(-227)+19×(-227)-5×(-227)

题目详情
计算题:
(1)(-49)-(+91)-(-5)+(-9);
(2)(−5
1
6
)÷(−
7
30
)×(−
6
31
);
(3)1+(-2)+|-2-3|-5;
(4)(-5)×(-7)-5×(-6);
(5)(
5
12
+
2
3
3
4
)×(−12);
(6)-7×(-
22
7
)+19×(-
22
7
)-5×(-
22
7
▼优质解答
答案和解析
(1)(-49)-(+91)-(-5)+(-9)
=-49-91+5-9
=-144;
(2)(−5
1
6
)÷(−
7
30
)×(−
6
31
)
=-
31
6
×(-
30
7
)×(-
6
31

=-
30
7

(3)1+(-2)+|-2-3|-5
=1-2+5-5
=-1;
(4)(-5)×(-7)-5×(-6)
=35+30
=65;
(5)(
5
12
+
2
3
3
4
)×(−12)
=-5-8+9
=-4;
(6)-7×(-
22
7
)+19×(-
22
7
)-5×(-
22
7

=(-7+19-5)×(-
22
7

=-22.