问题 填空题
计算:
(-1)÷9×
1
9
=______;
7
8
×(-
3
10
)×0×
17
19
=______.
答案

(-1)÷9×

1
9

=-1×

1
9
×
1
9

=-

1
81

7
8
×(-
3
10
)×0×
17
19
=0.

故答案为:-

1
81
,0.

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