Question

199又1/9X1/8+599又1/7X1又1/6-201又1/9X9/10-601又1/7X7/8

Answer 1

199又1/9X1/8+599又1/7X1又1/6-201又1/9X9/10-601又1/7X7/8
=(200-8/9)x1/8+(600-6/7)x7/6-(200+10/9)x9/10-(600+8/7)x7/8
=200x1/8-8/9x1/8+600x7/6-6/7x7/6-200x9/10-10/9x9/10-600x7/8-8/7x7/8
=25-1/9+700-1-180-1-625-1
=(700-180-600)-3-1/9
=-83又1/9

Answer 2

=(200-8/9)X(1/8)+(600-6/7)X(7/6)-(200+10/9)X(9/10)-(600+8/7)X(7/8)
=25-1/9+700-1-1800-1-525-1
=-1/9-1603=-1603又1/9

Answer 3

-78.2

追问

过程

追答

199/72+599/42-201/10-601/8
算出来是小数 保留一位后为-78.2