题目内容
用递等式计算(怎样简便就怎样计算). 96×1.25-1.25÷0.025 |
10.1×0.97 |
0.15×2.37+2.37×9.85 | 2.95+4.5÷0.36-12.48. |
分析:(1)96×1.25-1.25÷0.025,先算乘法、除法,再算减法;
(2)10.1×0.97,转化为:(10+0.1)×0.97,再运用乘法分配律简算;
(3)0.15×2.37+2.37×9.85,运用乘法分配律简算;
(4)2.95+4.5÷0.36-12.48,先算除法,再算加法、减法.
(2)10.1×0.97,转化为:(10+0.1)×0.97,再运用乘法分配律简算;
(3)0.15×2.37+2.37×9.85,运用乘法分配律简算;
(4)2.95+4.5÷0.36-12.48,先算除法,再算加法、减法.
解答:解:(1)96×1.25-1.25÷0.025
=120-50
=70;
(2)10.1×0.97
=(10+0.1)×0.97
=10×0.97+0.1×0.97
=9.7+0.097
=9.797;
(3)0.15×2.37+2.37×9.85
=(0.15+9.85)×2.37
=10×2.37
=23.7;
(4)2.95+4.5÷0.36-12.48
=2.95+12.5-12.48
=15.45-12.48
=2.97.
=120-50
=70;
(2)10.1×0.97
=(10+0.1)×0.97
=10×0.97+0.1×0.97
=9.7+0.097
=9.797;
(3)0.15×2.37+2.37×9.85
=(0.15+9.85)×2.37
=10×2.37
=23.7;
(4)2.95+4.5÷0.36-12.48
=2.95+12.5-12.48
=15.45-12.48
=2.97.
点评:此题考查的目的是理解掌握小数四则混合运算的顺序以及小数四则运算的计算法则,并且能够灵活选择简便方法进行计算.
练习册系列答案
相关题目