Question

在數(shù)軸上，3和－5所對(duì)應(yīng)的點(diǎn)之間的距離是________，到3和—5所對(duì)應(yīng)的兩點(diǎn)的距離相等的點(diǎn)所對(duì)應(yīng)的有理數(shù)是_____ ____，它的倒數(shù)是___ __.

 

Answer 1

【答案】

8,-1,-1

【解析】根據(jù)求數(shù)軸上兩點(diǎn)之間的距離等于較大的數(shù)減去較小的數(shù)，到數(shù)軸上兩點(diǎn)的距離相等的點(diǎn)所對(duì)應(yīng)的有理數(shù)是這兩個(gè)數(shù)的平均數(shù)，即可求出結(jié)果

3和-5所對(duì)應(yīng)的點(diǎn)之間的距離是：3-（-5）=8，

到3和-5所對(duì)應(yīng)的兩點(diǎn)的距離相等的點(diǎn)所對(duì)應(yīng)的有理數(shù)是：（3-5）÷2=-1，它的倒數(shù)是-1．