问题 解答题

计算:

①15.6789÷20÷5=______

②34.5×8.23-34.5+2.77×34.5=______

③0.9999×0.7+0.1111×2.7=______.

答案

①15.6789÷20÷5

=15.6789÷100

=0.156789;

②34.5×8.23-34.5+2.77×34.5

=34.5×(8.23+2.77-1)

=34.5×10

=345;

③0.9999×0.7+0.1111×2.7

=0.9999×0.7+0.9999×0.3

=0.9999×(0.7+0.3)

=0.9999;

故答案为0.156789;345;0.9999.

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