Question

2/9(1.8m-5.4n)- 3/7(2.1m-4.2)

Answer 1

= 25 M - 65 N - 9/10M + 95 = 0,5M - 1.2N + 1.8

Answer 2

2//9(1.8m-5.4n)-3//7(2.1m-4.2)=0.4m-1.2n-3//7*(2.1m-4.2)=0.4m-1.2n-(0.9m-1.8)=0.4m-1.2n-0.9m+1.8=-0.5m-1.2n+1.8

// - черта дроби