问题 解答题

下面怎样算简便就怎样算.

[9.08-(8.61+0.47)]÷3.09

4.2+0.8×(17.28÷4.8)

23.08-1.5×0.5-0.25

8.9×10.1

3.8×0.65÷3.8×0.65.

答案

(1)[9.08-(8.61+0.47)]÷3.09,

=[9.08-9.08]÷3.09,

=0÷3.09,

=0;

(2)4.2+0.8×(17.28÷4.8),

=4.2+0.8×3.6,

=4.2+2.88,

=7.08;

(3)23.08-1.5×0.5-0.25,

=23.08-0.75-0.25,

=23.08-(0.75+0.25),

=23.08-1,

=22.08;

(4)8.9×10.1,

=8.9×(10+0.1),

=8.9×10+8.9×0.1,

=89+0.89,

=89.89;

(5)3.8×0.65÷3.8×0.65,

=2.47÷3.8×0.65,

=0.65×0.65,

=0.4225.

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