(-3/7+1/3-9/14)/(-1/42)怎么简便计算

问题描述:

(-3/7+1/3-9/14)/(-1/42)怎么简便计算

(-3/7+1/3-9/14)/(-1/42)
=(-3/7+1/3-9/14)乘(-42)
=(-3/7)乘(-42)+1/3乘(-42)-9/14乘(-42)
=18-14+27
=31
+