Раскройте скобки и упростите
n-(n-(11n-7))
4m-((7x-3m)+9x)
13d-(8d-(13d-(4d+9)))
3f-(3f-((u-4f)12u))

1. n-(n-(11n-7)) n-(n-11n+7) n-n+11n-7 11n-72. 4m-((7x-3m)+9x) 4m-(7x-3m+9x) 4m-7x+3m-9x 7m-16x3. 13d-(8d-(13d-(4d+9))) 13d-(8d-(13d-4d-9)) 13d-(8d-13d+4d+9) 13d-8d+13d-4d-9 14d-94. 3f-(3f-((u-4f)12u)) тут скорее всего опечатка. Возможно два случая: а) 3f-(3f-((u-4f)+12u)) 3f-(3f-(u-4f+12u)) 3f-(3f-u+4f-12u) 3f-3f+u-4f+12u -4f+13uб) 3f-(3f-((u-4f)-12u)) 3f-(3f-(u-4f-12u)) 3f-(3f-u+4f+12u) 3f-3f+u-4f-12u -4f-11u