发布网友 发布时间:2024-10-03 08:14
共2个回答
热心网友 时间:2024-10-12 06:44
(-a)+b-(-c)热心网友 时间:2024-10-12 06:48
答:原式=-a+b+c= - 2/3 +(-3/4)-1/2= - (2/3+3/4+1/2)= - ( 2/3+3/4+2/4)= - (2/3+5/4)=- (8/12+15/12)= - 23/12热心网友 时间:2024-10-12 06:45
(-a)+b-(-c)热心网友 时间:2024-10-12 06:44
答:原式=-a+b+c= - 2/3 +(-3/4)-1/2= - (2/3+3/4+1/2)= - ( 2/3+3/4+2/4)= - (2/3+5/4)=- (8/12+15/12)= - 23/12