问题 解答题

用递等式计算,能简便计算的要简便计算.

0.034×0.5×0.6

50.4×1.9-1.8

25.8+3.76×0.25

102×0.45.

答案

(1)0.034×0.5×0.6,

=0.034×(0.5×0.6),

=0.034×0.3,

=0.0102;

(2)50.4×1.9-1.8,

=95.76-1.8,

=93.96;

(3)25.8+3.76×0.25,

=25.8+3.76×

1
4

=25.8+0.94,

=26.74;

(4)102×0.45,

=(100+2)×0.45,

=100×0.45+2×0.45,

=45+0.9,

=45.9.

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