-89又17/18乘以9等于多少？

-89又17/18×9 =(-90+1/18)×9 =-90×9+9×1/18 =-810+1/2 =-809又1/2 (-3)×2又1/3+2×(-2又1/3)+(-5)×(-7/3) =(-3)×7/3-2×7/3+5×7/3 =(-3-2+5)×7/3 =0×7/3 =0