2(m+n) - 6(m-n) =
= 2m + 2n - 6m + 6n =
= 8n - 4m,
при m = -2 3/4; n = 3,5:
8 * 3,5 - 4 * (-2 3/4) = 28 + 4 * 11/4 = 28 + 11 = 39
-2 3/4=-2,75.
2(m+n)-6(m-n)=2m+2n-6m+6n=8n-4m=4(2n-m)=4(2*3,5+2,75)=4*9,75=39.
2(m+n) - 6(m-n) =
= 2m + 2n - 6m + 6n =
= 8n - 4m,
при m = -2 3/4; n = 3,5:
8 * 3,5 - 4 * (-2 3/4) = 28 + 4 * 11/4 = 28 + 11 = 39
-2 3/4=-2,75.
2(m+n)-6(m-n)=2m+2n-6m+6n=8n-4m=4(2n-m)=4(2*3,5+2,75)=4*9,75=39.