(7 . 13 + 8 . 13) / (8 + 21 - x) = 39
13 (7 + 8) / (8 + 21 - x) = 39
13 . 15 / (8 + 21 - x) = 39
13 . 3 . 5 / (8 + 21 - x) = 39
39 . 5 / (8 + 21 - x) = 39
5 / (29 - x) = 1
29 - x = 5
x = 24
(7 . 13 + 8 . 13) / (8 + 21 - x) = 39
13 (7 + 8) / (8 + 21 - x) = 39
13 . 15 / (8 + 21 - x) = 39
13 . 3 . 5 / (8 + 21 - x) = 39
39 . 5 / (8 + 21 - x) = 39
5 / (29 - x) = 1
29 - x = 5
x = 24
7 phần 13 x 7 phần 15 - 5 phần 12 x 21 phần 39 + 49 phần 91 x 8 phần 15
bài 1. Tính
a) 7/-25 + -8/25 b) 6/13 + -15/39 c) 5/7 + 4/-14 d) -8/18 + -15/27
bài 2. Tính
a) 3/5 + -7/4 b) (-2) + -5/8 c) 1/8 + -5/9 d) 6/13 + -14/39 e) -18/24 + 15/21
Tìm x , biết:
1) 476 : x = 28
2) x : 26 = 39
3) 6.x - 5 = 613
4) x - 36 : 18 = 12
5) 9.x - 13 = 671
6) x : 7 - 13 =57
7) x + 13 = 14
8) x - 19 = 21
9 ) x : 13 = 6
10) 74 - x = 13
Tính
18/45 - 4/12 - 6/9 - 21/35
4/3 + 3/5 + 7/3 + 2/5 + 1/3
7/25 x 39/14 x 50/78
1/3 x 4/5 x 1/3 x 6/5
6/7 x 8/13 + 6/7 x 9/13 - 3/13 x 6/7
TINH NHANH
7/13 . 7/15 - 5/12 . 21/39 + 49/91 . 8/5
(7 nhân 13 + 8 nhân 13) : ( 9 và 2/3 -x)= 39
5. \(\dfrac{-3}{7}\) + \(\dfrac{5}{13}\) + \(\dfrac{-4}{12}\)
6. \(\dfrac{-5}{21}\) + \(\dfrac{-2}{21}\) + \(\dfrac{8}{24}\)
7. \(\dfrac{5}{13}\) + \(\dfrac{-5}{7}\) + \(\dfrac{-20}{41}\) + \(\dfrac{8}{13}\) + \(\dfrac{-21}{41}\)
Giúp tớ với ạ🥺👉🏻👈🏻 Tớ cảm ơn nhiều🥰
d) \(\dfrac{-3 }{7 } + \dfrac{5 }{ 13 }+ \dfrac{-4 }{ 7}\)
\(e ) \dfrac{-5}{21}+ \dfrac{-2}{21}+\dfrac{-8}{24}\) \(\dfrac{-3 }{7 } + \dfrac{5 }{ 13 }+ \dfrac{-4 }{ 7}\)\( e)\dfrac{-5 }{ 21} + \dfrac{-2 }{21 } + \dfrac{-8 }{ 4}\)
f