问题 解答题

计算下面各题,能简便的用简便运算

(1)143×27+251-342÷3

(2)25×24

(3)(125-30)×40

(4)256×42-256-256×21

(5)632+187+368+223

(6)102×76.

答案

(1)143×27+251-342÷3,

=3861+251-114,

=4112-114,

=3998;

(2)25×24,

=25×(4×6),

=(25×4)×6,

=100×6,

=600;

(3)(125-30)×40,

=125×40-30×40,

=5000-1200,

=3800;

(4)256×42-256-256×21,

=256×(42-1-21),

=256×20,

=5120;

(5)632+187+368+223,

=(632+368)+(187+223),

=1000+410,

=1410;

(6)102×76,

=(100+2)×76,

=100×76+2×76,

=7600+152,

=7752.

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