问题 解答题

计算下面各题,怎样简便就怎样算.

284+28+116

180+74+27+126+120+73

2×l25×8×5

125×897×835×101

33×46+46×17

973×5×2

68×99.

答案

(1)284+28+116,

=(284+116)+28,

=400+28,

=428;

(2)180+74+27+126+120+73,

=(180+120)+(74+126)+(27+73),

=300+200+100,

=500+100,

=600;

(3)2×l25×8×5,

=(2×5)×(125×8),

=10×1000,

=10000;

(4)125×897×835×101,

=112125×835×101,

=93624375×101,

=9456061875;

(5)33×46+46×17,

=46×(33+17),

=46×50,

=2300;

(6)973×5×2,

=973×(5×2),

=973×10,

=9730;

(7)68×99,

=68×(100-1),

=68×100-68×1,

=6800-68,

=6732.

单项选择题
单项选择题