-1/42÷[1/2-1/3+5/7+4/9×(-6)]=-1/42÷(1/6+5/7-8/3)=-1/42÷(-25/14)=1/75
-1/42÷[1/2-1/3+5/7+4/9×(-6)]=-1/42÷[-25/14]=1/75
彤姐夫呢😊