问题
填空题
599×0.2100=______;(-
|
答案
599×0.2100,
=599×0.299×0.2,
=(5×0.2)99×0.2,
=0.2;
(-
)7×814,1 9
=(-
)7×(92)4,1 9
=(-
)7×98,1 9
=(-
×9)7×9,1 9
=(-1)7×9,
=-1×9,
=-9.
599×0.2100=______;(-
|
599×0.2100,
=599×0.299×0.2,
=(5×0.2)99×0.2,
=0.2;
(-
)7×814,1 9
=(-
)7×(92)4,1 9
=(-
)7×98,1 9
=(-
×9)7×9,1 9
=(-1)7×9,
=-1×9,
=-9.