Question

упростите выражения: -(m+2n-7)-(-2m-5+8)

Answer 1

-(m+2n-7)-(-2m-5+8)= m - 2n +7 + 2m +5 - 8 = 3m - 2n - 1

Answer 2

-m-2n+7+2m+5-8=m-2n+4=2*(0,5m-n+2)