1去括号 1.n-3(4-2m) 2.t+2/3(12-9v) 3.-1/2(x+y)+1/4(p+q) 4.4(m+p)-7(n-2q)

1去括号 1.n-3(4-2m) 2.t+2/3(12-9v) 3.-1/2(x+y)+1/4(p+q) 4.4(m+p)-7(n-2q)
1去括号 1.n-3(4-2m) 2.t+2/3(12-9v) 3.-1/2(x+y)+1/4(p+q) 4.4(m+p)-7(n-2q)

1去括号 1.n-3(4-2m) 2.t+2/3(12-9v) 3.-1/2(x+y)+1/4(p+q) 4.4(m+p)-7(n-2q)
1.n-3(4-2m) =n-12+6m
2.t+2/3(12-9v)=t+8-6v
3.-1/2(x+y)+1/4(p+q)=-1/2x-1/2y+1/4p+1/4q
4.4(m+p)-7(n-2q)=4m+4p-7n+14q

1 n+6m-12 2 t-6v+8 3 .-1/2x-1/2y+1/4p)+1/4q 4 4m+4p+14q-7n