问题 解答题
用简便方法计算.
301×79
25×32×125125×88
8.59+2.57+3.43+5.4749.62+27.17-19.621546-(546-239)
答案

(1)301×79

=(300+1)×79,

=300×79+1×79,

=23700+79,

=23779;

(2)25×32×125

=25×4×8×125,

=(25×4)×(8×125),

=100×1000,

=100000;

(3)125×88

=125×8×11,

=1000×11,

=11000;

(4)8.59+2.57+3.43+5.47

=8.59+(2.57+3.43)+5.47,

=8.59+6+5.47,

=20.06;

(5)49.62+27.17-19.62

=49.62-19.62+27.17,

=30+27.17,

=57.17;

(6)1546-(546-239)

=1546-546+239,

=1000+239,

=1239.

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