题目内容
【题目】一堆煤,第一次用去总数的23%,第二次用去总数的31%,两次共用去百分之几?还剩百分之几?
【答案】用去54%,还剩46%.
【解析】
试题分析:把一堆煤的数量看作单位“1”,两次共用去百分之几就用第一次用去的百分数加上第二次用去的百分数,求还剩百分之几就用单位“1”减去两次共用去的百分数即可.
解:23%+31%=54%
1﹣54%=46%
答:两次共用去54%,还剩46%.
练习册系列答案
相关题目
【题目】分数、百分数、小数互化. 例:=0.5=50%
= = | = =12.5% |
=0.1= | = = |
= =37.5% | =0.05= |
= = | = =62.5% |
=0.04= | = = |
= =87.5% | =0.02= |
= = | = = . |