问题 解答题

3.5×9.9+6.5×10.1.

答案

3.5×9.9+6.5×10.1,

=3.5×(10-0.1)+6.5×(10+0.1),

=3.5×10-3.5×0.1+6.5×10+6.5×0.1,

=35-0.35+65+0.65,

=(35+65)+(0.65-0.35)

=100+0.3,

=100.3.

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