几道计算题!在线等10分钟!详细过程!
问题描述:
几道计算题!在线等10分钟!详细过程!
-(2/13-1/3-1/6)×78
(-2/3)×27/8÷(3/2)³
1/30-(-2/3+3/5)÷(-2)
答
-(2/13-1/3-1/6)×78
=-2/13×78+1/3×78+1/6×78
=-12+26+13
=27
(-2/3)×27/8÷(3/2)³
=-9/4÷9/4
=-1
1/30-(-2/3+3/5)÷(-2)
=1/30-(-10/15+9/15)÷(-2)
=1/30-1/30
=0第二题不对吧!(-2/3)×27/8÷(3/2)³=-9/4÷27/8=-2/3