Question

10*a=20 19*b=5*-1 求9*a除以3*2b的值

Answer 1

19*b=5*-1

应该是10*b=5*-1

所以10*a÷10*b=10*(b-a)=2÷5*-1=100=10*2

所以b-a=2

9*a÷3*2b

=9*a÷(3*2)*b

=9*a÷9*b

=9*(a-b)

=9*2

=81