Question

简单的题

Answer 1

4+2+1=7
84分别乘以4/7,2/7,1/7
再把三个数相乘

Answer 2

84÷4÷(4+2+1)=21÷7=3

追答

3×4=12，3×2=6，3×1=3

12×6×1=72

12×6×3=216