问题 解答题

怎样算简便就怎样算

2+2.7+7.3+6.8;9.8×10.1;0.72÷0.4÷0.3.

答案

①2+2.7+7.3+6.8

=(2.7+7.3)+(2+6.8)

=10+8.8

=18.8;

②9.8×10.1

=9.8×10+9.8×0.1

=98+0.98

=98.98;

③0.72÷0.4÷0.3

=0.72÷(0.4×0.3)

=0.72÷0.12

=6.

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