6/5-12/7+20/9+-30/11+42/13=?要用简便算法.是搞反了
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/29 21:46:47
![6/5-12/7+20/9+-30/11+42/13=?要用简便算法.是搞反了](/uploads/image/z/188678-38-8.jpg?t=6%2F5-12%2F7%2B20%2F9%2B-30%2F11%2B42%2F13%3D%3F%E8%A6%81%E7%94%A8%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95.%E6%98%AF%E6%90%9E%E5%8F%8D%E4%BA%86)
6/5-12/7+20/9+-30/11+42/13=?要用简便算法.是搞反了
6/5-12/7+20/9+-30/11+42/13=?要用简便算法.
是搞反了
6/5-12/7+20/9+-30/11+42/13=?要用简便算法.是搞反了
没简便方法……我怀疑你把分母分子弄反了,题目应该是:5/6-12/7+9/20-11/30+13/42,如果是这样的话时候简便方法的:原式=(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)=1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7=1/2+1/7=9/14.