a: =>x:1/2=5/9
=>x=10/9
b: =>x*2/5=7/3
=>x=7/3:2/5=7/3*5/2=35/6
c: =>x=7/8-9/16=5/16
a: =>x:1/2=5/9
=>x=10/9
b: =>x*2/5=7/3
=>x=7/3:2/5=7/3*5/2=35/6
c: =>x=7/8-9/16=5/16
a) 1+4/3
b) 5/9 : 2/3
c ) 4/3-1/3x5/2
d) ( 3/2-3/8):1/2
e) 15/16 : 3/8 x 3/4
f) 7/19 x 1/3 x 7/19 x 2/3
g) 3/5x 8/27 x 25/3
h) 1/5 + 4/11 + 4/5 + 7/11
Tính:
a) 2/3 + 52 - 3/4
b) 2/5 x 1/2 : 1/3
c) 1/2 x 1/3 + 1/4
d) 2/7 : 2/3 - 1/7
e) 7/9 x 3/14 : 5/8
g) 5/12 - 7/32 : 21/16
tính
a) 1/3 + 3/4 x 2/9
b) 2-(2/5 +2/3)
c) 2/5 : 4/7 +1/3
d)9/13 : 3/26 - 8/13
Tính giá trị biểu thức :
a, 3/4 + 1/2 x 7/2 b, 6/15 - 1/3 : 5/3
c, x - 4/9 = 3/7 : 9/4 d, 7/9 x 3/5 - 1/2 = 1/5
Tìm X, biết:
A) X x 2/5 + 1/2 x X = 9
B) 1/9 : X + 3/9 : X =5/7
bài 1 : tìm x
a, 1/5=5=1/2 b, 11/5+x=9
c,5-x=7/17 d, x-1/3=16/5:3/2
e,8/9:x=11/2 g, x:31/5=2+7/2
h,7/8x íc=29/2-2
giải hết ra cho mink nha
Tính :
2/5 + 11/15 =
7/8 - 7/9 =
11/13 x 26/31 =
16/24 : 4 =
30 : 6/5 =
9/16 : 4 =
1/2 : 1/3 x 8/15 =
Bài 1 : Tính nhanh :
a, 2/3 + 3/4 + 4/5 + 12/9 + 28/6 + 48/15.
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16 ;
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16 ;
d, ( 1 + 1/2 ) x ( 1 + 1/3) x ( 1 + 1/4 ) x...x ( 1 + 1/175)
Tính nhanh mỗi biểu thức sau:
a, 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20
b, 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x (4 x 9 - 36)
c, (81 - 7 x 9 - 18) : (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)
d, (6 x 5 + 7 - 37) x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10)
e, (11 x 9 - 100 + 1) : (1 x 2 x 3 x 4 x ... x 10)
g, (m : 1 - m x 1) : (m x 2008 + m x 2008)
h, (2 + 4 + 6 + 8 + m x n) x (324 x 3 - 972)
l, (1 + 2 + 3 + ... + 99) x (13 x 15 - 12 x 15 - 15)
i, (0 x 1 x 2 x...x 99 x 100) : (2 + 4 + 6 +...+ 98)
k, (0 + 1 + 2 +...+ 97 + 99) x (45 x 3 - 45 x 2 - 45)
(Chú ý : trong tất cả các phép tính trên đều không có số âm)