问题 解答题

计算,怎样简便就怎样算

(1)315×156×38        

(2)252528×4

(3)710÷10+710               

(4)( 29+227 )×27

(5)157×5.6+45                 

(6)35×1310×31721.

答案

(1)315×156×38,

=315×156×2×19,

=315×2×156×19,

=630×156×19,

=98280×19,

=1867320;

(2)252528×4,

=(250000+2500+20+8)×4,

=250000×4+2500×4+20×4+8×4,

=1000000+10000+80+32,

=1010112;

(3)710÷10+710,

=71+710,

=781;

(4)(29+227)×27,

=(250+6)×27,

=250×27+6×27,

=6750+162,

=6912;

(5)157×5.6+45,

=(100+57)×5.6+45,

=100×5.6+57×5.6+45,

=560+319.2+45,

=924.2;

(6)35×1310×31721,

=5×7×1310×31721,

=(5×1310)×(7×31721),

=6550×222047,

=1454407850.

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