Đáp án:
CHÚC BẠN HỌC TỐT !!!!!!
Giải thích các bước giải:
a)
(1 4/23) - (5/-21) - 4/23 - 0,5 + (2 16/21)
= 27/23 + 5/21 - 4/23 - 1/2 + 58/21
= (27/23 - 4/23) + (5/21 + 57/21) - 1/2
= 1 + 3 + 1/2
= 9/2
b)
(0,5 - 7/13 - 1/3) - (6/13 + -1/2 - 1 1/3)
= 1/2 - 7/13 - 1/3 - 6/13 + 1/2 + 4/3
= (1/2 + 1/2) - (7/13 + 6/13) - (1/3 - 4/3)
= 1 - 1 - (-1)
= 1
c)
(-2/5 + 3/10) : (2/-5 + |-4/3 - 2|)
= (-4/10 + 3/10) : (-2/5 + 4/3 + 2)
= -1/10 : (-6/15 + 20/15 + 30/15)
= -1/10 : 44/15
= -1.15/10.44
= -3/88
d)
12,5.(-5/7) + 9 3/4 - 1,5.5/7
= (-5/7).(12,5 + 1,5) + 39/4
= -5.14/7 + 39/4
= -20/4 + 39/4
= 19/4
e)
(-1/4).(-5/13) - 5/4 . (-7/13) + 1/1,3
= 5/52 + 35/52 + 40/52
= 20/13
f)
(-3/4 + 5/13) : 2/7 - (2 1/4 + 8/13) : 2/7
= (-3/4 + 5/13 - 9/4 - 8/13) : 2/7
= [(-3/4 - 9/4) + (5/13 - 8/13)] . 7/2
= (-3 - 3/13) . 7/2
= -42/13 . 7/2
= -147/13
