`[13]`
`15/4 - x = 5/12 + 4/3`
`15/4 - x = 7/4`
`x = 15/4 - 7/4`
`x= 2`
`[13]`
`15/4 - x = 5/12 + 4/3`
`15/4 - x = 7/4`
`x = 15/4 - 7/4`
`x= 2`
Tính :
a) 5 / 12 + 3 / 14 + 7 / 12
b) 15 / 14 x 17 / 18 x 28 / 15
c) 5 / 8 x 5 / 4 + 5 / 4 x 3 / 8
Tính :
a) 5 / 12 + 3 / 14 + 7 / 12
b) 15 / 14 x 17 / 18 x 28 / 15
c) 5 / 8 x 5 / 4 + 5 / 4 x 3 / 8
Tính (theo mẫu)
Mẫu: 3 x (5 + 4) = ?
Cách 1:
3 x (5 + 4) = 3 x 9 = 27
Cách 2:
3 x (5 + 4) = 3 x 5 + 3 x 4 = 15 + 12 = 27
a) 5 x (10 + 9)
b) 10 x (30 + 5)
5/6 + 5/8 + 3/4
12/15 + 3 + 3/5
4/3 x 7/8 x 5
8/9 x 6/5 : 3
7/12 + 5/8 x 4/3 - 3/4
(8/5 - 7/6) : 13/15 + 1/4
a. 5/3 - y = 7/12 : 5/6
b.4/15 : y = (4/5 + 1/2) x 4/13
giúp mình nha
a)x-3/4=5/12 : 10/3
b)7/6 - x=3/5 x 15/18
Bài 1:Tính
a) 11/4 - 9/8 + 15/12 b) 6/7 x 21/12 + 5/3
c) 13/18 : 5/9 -1 d) 3 + 9/4 : 3/5
Bài 12. Tính a) 7/12 + 3/4 x 2/9 b) 8/9-4/15:2/5 c) (7/9+5/6)x3/5
tìm X biết :
a.2/3 : 5/7 : x/9 = 2/7 : 3/5 :10/9
b.3/5 : 7/x : 3/4 = 12/105
c.x : 1/2 = 2/3 x 4/5 x 3/4 x 15/8
Tính nhanh
a,(1+2 +3 +...+99) x (13 x 15 – 12 x 15 –15)
b,2+4+ 6+...+ 98+100–(1+3 +5 +...+97+99)