几道初中数学题-216-157+348+512-678-2/3+(-1/6)-(-1/4)-1/2要写出过程

Question

几道初中数学题-216-157+348+512-678 -2/3+(-1/6)-(-1/4)-1/2 要写出过程

Answer 1

-216-157+348+512-678 =512+348-678-216-157 =512+348-（678+216+157） =860-1051 =-191 -2/3+(-1/6)-(-1/4)-1/2 =-2/3-1/6+1/4-1/2 =1/4-(1/6+2/3+1/2） =3/12-(2/12+8/12+6/12) =3/12-16/12 =-13/12