回答1:
直接展开,去括号计算
(n-3m+2)-(4m-2n+1)
=n-3m+2-4m+2n-1
=(n+2n)-(3m+4m)+(2-1)
=3n-7m+1
回答2:
(n-3m+2)-(4m-2n+1)
=n-3m+2-4m+2n-1
=(n+2n)-(3m+4m)+(2-1)
=3n-7m+1
回答1:
直接展开,去括号计算
(n-3m+2)-(4m-2n+1)
=n-3m+2-4m+2n-1
=(n+2n)-(3m+4m)+(2-1)
=3n-7m+1
回答2:
(n-3m+2)-(4m-2n+1)
=n-3m+2-4m+2n-1
=(n+2n)-(3m+4m)+(2-1)
=3n-7m+1