计算:12+1又3/4-8又5/12-6.75 计算:|12.7-(-8.9)|
问题描述:
计算:12+1又3/4-8又5/12-6.75 计算:|12.7-(-8.9)|
答
12+1又3/4-8又5/12-6.75
=12+1.75-8又5/12-6.75
=12+1.75-6.75 -8又5/12
=7-8又5/1=-1又5/12
|12.7-(-8.9)|=|12.7+8.9|=|21.6|=21.6