题目内容
7.27-(1.98+0.27) | 23.4×18-23.4×8 |
解:①7.27-(1.98+0.27),
=7.27-1.98-0.27,
=(7.27-0.27)-1.98,
=7-2+0.02,
=5.02;
②23.4×18-23.4×8,
=23.4×(18-8),
=23.4×10,
=234.
=7.27-1.98-0.27,
=(7.27-0.27)-1.98,
=7-2+0.02,
=5.02;
②23.4×18-23.4×8,
=23.4×(18-8),
=23.4×10,
=234.
分析:
①7.27-(1.98+0.27)利用一个数减去两个数的和,去掉括号变成连减计算,再把1.98变成-2+0.02计算; |
②23.4×18-23.4×8利用乘法分配律计算简便.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
练习册系列答案
相关题目
脱式计算 能简则简
7.27-(1.98+0.27) | 23.4×18-23.4×8 | ×101- | ×898. |