问题
解答题
用简便方法计算.
|
答案
15×24×25,
=24×25×15,
=600×15,
=9000;
25×5×4×40,
=(25×4)×(40×5),
=100×200,
=20000;
800÷5÷4,
=800÷(5×4),
=800÷20,
=40;
560÷(5×7),
=560÷7÷5,
=80÷5,
=16.
用简便方法计算.
|
15×24×25,
=24×25×15,
=600×15,
=9000;
25×5×4×40,
=(25×4)×(40×5),
=100×200,
=20000;
800÷5÷4,
=800÷(5×4),
=800÷20,
=40;
560÷(5×7),
=560÷7÷5,
=80÷5,
=16.