Question

m为何值时,式子(2m-5m-1)/3的值与式子(7-m/2)的值的和等于5

Answer 1

(2m-5m-1)/3+(7-m/2)=5

(-3m-1)/3+7-m/2=5

2(-3m-1)+42-3m=30

-6m-2+42-3m=30

-9m=-10

m=10/9