Question

(1) -(2m-3) (2) n-3(4-2m) (3) 16a-8(3b+4c)

Answer 1

1) -(2m-3)=-2m+3

(2) n-3(4-2m)=n-12+6m

(3) 16a-8(3b+4c)=16a-24b-32c

(4) t+2/3(12-9v)=t+8-6v

(5)-(5m+n)-7(a-3b)=-5m-n-7a+21b

(6)-1/2(X+Y)+1/4(p+q)=-1/2X-1/2Y+1/4P+1/4q

(7)-8(3a-2ab+4)=-24a+16ab-24

(8)4(m+p)-7(n-2q)=4m+4p-7n+14q

把括号打开后,如果括号前面有-好,就相仿与乘以-1,就可以了