Question

脱式计算,注意使用计算简便!7\8-3\4+1\61-3\5-2\75\3-4\9-2\33\5+4\9+2\55\8-

Answer 1

78-34+16

=21/24-18/24+4/24

=7/24

1-35-27

=35/35-21/35-10/35

=4/35

53-49-23

=1-4/9

=5/9

35+49+25

=1+4/9

=13/9

58-(23-12)

=5/8-1/6

=11/24

57+14-57

=1/4

要采纳先回答的正确答案.是对答题者劳动的尊重.