问题 填空题
计算:-7+(+2)=______,-5-5=______,-2001
10
17
×0=______,(-25)×(+1.2)=______,(-1
2
5
)×(-
5
49
)=______,(-2
1
7
)÷(-
5
14
)=______,(-1)÷(+
3
5
)=______,
1
6
÷(-2.5)=______.
答案

-7+(+2)=-7+2=-5;

-5-5=-10;

-2001

10
17
×0=0;

(-25)×(+1.2)=25×1.2=-30;

(-1

2
5
)×(-
5
49
)=-
7
5
×(-
5
49
)
=
1
7

(-2

1
7
)÷(-
5
14
)=-
15
7
×(-
14
5
)
=6;

(-1)÷(+

3
5
)=-1×
5
3
=-
5
3

1
6
÷(-2.5)=-
1
6
×
2
5
=-
1
15

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