Question

去括号：(1).-(x-1)=（2）.2(-a+1/2b)=(3).-1/2(y-2z)=(4)-0.2(5*5x+1)

Answer 1

(1).-(x-1)=-X+1

（2）.2(-a+1/2b)=-2a+b

(3).-1/2(y-2z)=-1/2y+z

(4)-0.2(5*5x+1)= -5x-0.2