5/7×16×21/5怎么简便运算?

5/7×16×21/5怎么简便运算?
5/7×16×21/5怎么简便运算?

5/7×16×21/5怎么简便运算?
7与21相约得3,分子中的5与分母的5相约,所以最后答案为3x16=48

5/7×21/5×16
=3*16=48

5/7×16×21/5
=5/7×21/5×16
=3×16
=48