题目内容
计算,能使用简便方法吗?
27×12-286÷13
(339-67)×15÷24
25×294×4
4000÷125÷8
18×45+18×55
2.39+14.4+0.61.
27×12-286÷13
(339-67)×15÷24
25×294×4
4000÷125÷8
18×45+18×55
2.39+14.4+0.61.
(1)27×12-286÷13,
=324-22,
=302;
(2)(339-67)×15÷24,
=272×
,
=170;
(3)25×294×4,
=(25×4)×294,
=100×294,
=29400;
(4)4000÷125÷8,
=4000÷(125×8),
=4000÷1000,
=4;
(5)18×45+18×55,
=(45+55)×18,
=100×18,
=1800;
(6)2.39+14.4+0.61
=2.39+0.61+14.4,
=3+14.4,
=17.4.
=324-22,
=302;
(2)(339-67)×15÷24,
=272×
| 5 |
| 8 |
=170;
(3)25×294×4,
=(25×4)×294,
=100×294,
=29400;
(4)4000÷125÷8,
=4000÷(125×8),
=4000÷1000,
=4;
(5)18×45+18×55,
=(45+55)×18,
=100×18,
=1800;
(6)2.39+14.4+0.61
=2.39+0.61+14.4,
=3+14.4,
=17.4.
练习册系列答案
相关题目