Question

8a的3次方b的m次方÷b分之28a的n次方＝7分之2b的2次方,求m-n

Answer 1

8a^3b^m/(28a^n/b)＝2b^2/7

a^3b^m/(a^n/b)＝b^2

a^3b^m＝ba^n

n=3

m=1

m-n=1-3=-2