(2/3-4/9+5/27)*27-2又3/17*8+2/17*8简便计算

(2/3-4/9+5/27)*27-2又3/17*8+2/17*8=(2/3)*27 - (4/9)*27 + (5/27)*27 +(-2又3/17+ 2/17)*8=18- 12 + 5 +(-2 - 1/17)*8=11-16- 8/17=-5- 8/17=-5又8/17-3又1/7*(-3)+(-1又3/4）*12/7*（5又1/7-1又1/3）=(3又1/7)*3+(-7/4)*12/7*（4+ 1/7- 1/3）=(3又1/7)*3 - 3*(4+ 1/7- 1/3)=3*(3又1/7 - 4 - 1/7 + 1/3)=3*(-1+ 1/3)=-3+ 1=-2