问题 解答题

用递等式计算(能巧算的要巧算)

2375-216÷18×25

16×75×125

32×81+81×68

2788÷(142×2-243)

1001×29-125×29×8

5600÷[184+11×(453-397)].

答案

(1)2375-216÷18×25,

=2375-12×25,

=2375-300,

=2075;

(2)16×75×125,

=2×8×75×125,

=(2×75)×(8×125),

=150×1000,

=150000;

(3)32×81+81×68,

=(32+68)×81,

=100×81,

=8100;

(4)2788÷(142×2-243),

=2788÷(284-243),

=2788÷41,

=68;

(5)1001×29-125×29×8,

=(1001-125×8)×29,

=(1001-1000)×29,

=1×29,

=29;

(6)5600÷[184+11×(453-397)],

=5600÷[184+11×56],

=5600÷[184+616],

=5600÷800,

=7.

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