先化简,再求值:3n-[5n+(3n-1)],其中n=6
问题描述:
先化简,再求值:3n-[5n+(3n-1)],其中n=6
答
3n-[5n+(3n-1)] = 3n-(8n-1) = -5n+1 = -5*6+1 = -30+1 = -29
先化简,再求值:3n-[5n+(3n-1)],其中n=6
3n-[5n+(3n-1)] = 3n-(8n-1) = -5n+1 = -5*6+1 = -30+1 = -29