问题 填空题

530-0.229=______; 982-101×99=______.

答案

530•0.229

=530×(

1
5
29

=529×5×(

1
5
29

=(5×

1
5
29×5

=129×5

=1×5

=5;

982-101×99

=982-(100+1)(100-1)

=982-1002+1

=(98+100)×(98-100)+1

=198×(-2)+1

=-395,

故答案为:5,-395.

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