89又17/18×(-9)=?

日期:2013-09-20 15:51:19 人气:1

89又17/18×(-9)=?

89又17/18×(-9) =(90-1/18)×(-9) =-9×90+1/18×(-9) =-810-1/2 =-810又1/2 (2/3-4/9+5/27)27-1又1/17×8+1/17×8 =2/3×27-4/9×27+5/27×27-(18/17-1/17)×8 =18-12+5-1×8 =11-8 =3
    A+
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