问题 填空题
599×0.2100=______;(-
1
9
7×814=______.
答案

599×0.2100

=599×0.299×0.2,

=(5×0.2)99×0.2,

=0.2;

(-

1
9
7×814

=(-

1
9
7×(924

=(-

1
9
7×98

=(-

1
9
×9)7×9,

=(-1)7×9,

=-1×9,

=-9.

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