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.