1/4 - 1/4 : 2²
= 1/4 - 1/4 . 1/4
= 1/4 . (1 - 1/4)
= 1/4 . 3/4
= 3/16
--------------------
2/3 . 5/11 + 2/3 . 6/11 - 1 1/3
= 2/3 . 5/11 + 2/3 . 6/21 - 4/3
= 2/3 . (5/11 + 6/11 - 2)
= 2/3 . (1 - 2)
= 2/3 . (-1)
= -2/3
k) (-1/2)2:1/4-2.(-1/2)2
m) (-2)3.-1/24+(4/3-1 5/6):5/12
n) (6 4/9 + 7/11) - (4 4/9 - 2 4/11)
p) 10 1/5 - 5 1/2. 60/11+3:15%
q) 5/7.5/11+5/7.2/11-5/7.14/11
r) -5/7.2/11+-5/7.9/11+1 5/7
GIÚP MÌNH VỚI Ạ. CẢM ƠN MỌI NGƯỜI!
Bài 1 Tìm x,biết
x.3/5=2/3
x.7/17=17/8
3/4 chia x=-7/12
3/8 - 1/6.x=1/4
1/3+1/2 chia x=-4
Bài 2 Tính
-6/11 chia [3/5 . 4/11]
7/12 + 5/12 chia 6 -11/36
[4/5 + 1/2] chia [3/13 - 8/13]
[2/3 - 1/4 + 5/11] chia [5/12 + 1 -7/11]
*Dấu . là dấu nhân nha mn*
a) 1/2 - 5/6 + 11/33 - 35/40
b) 2/3 . 1 3/4 - 8/9 - 17/51 - 1/5
c) 1/2 . 2 - 2 5/7 + 6/4 - 10/15
d) 1/6 . 1/11 + 4/11 . ( -1/6) + 8/11 . 1/6 + 1/6 . 6/11
e) -17 . (-23) + (-53) . 17 +17 . 14 + 17 .(-24)
f) -19,218 + (-82) .19 - 533 . 19 + (-19) . 167
g) 2/5 + 3/8 - 11/44 + 9/16
h) 4/10 - 1 5/6 . 2 + 7/8 -1/9
i ) 3. 1/5 - 2/8 - 12/36 + 15/9
k) 6/8 . 3 1/2 + 4 2/3 - 11/55 + 17/51
l ) 1/3 . 3 1/2 - 4 2/5 - 26/78 + 17/51
11 3/4 - ( 6 5/6 - 4 1/2 ) + 1 2/3
( vd 11 3/4 có nghĩa là 11 và 3/4 nhé ! )
Bài 1 : thực hiên jpheps tính :
A=8/7+4/7.-6/11-4/11.5/11
B= 1/5:1/10-1/3.[6/5-(2-1/2)^2] + (-1/2)^3
Bài 2 :
a) 3/4 +1/4 : x =-3
(x-1/3)^2+5/9 =1
A= ( 6 : 3/5 - 1 1/6 x 6/7 ) : ( 4 1/5 x 10/11 + 5 2/11 )
B= ( 1 - 1/2 ) x ( 1- 1/4 ) x ... x ( 1 - 1/2003 ) x ( 1 - 1/2004 )
C= 5 9/10 : 3/2 - ( 2 1/3 x 4 1/2 - 2 x 2 1/3 ) : 7/4
Tính
41-13,5:3+4,25*4
12,354*650+12,354*351-12,354
5/3/4-(2/1/3+1/3/4)
3/7+5/11+4/7+1/6/11-2/1/2
1+3+5+7+9+11+...+2015+2017
d] D=6/3*5+6/5*7+...+6/97*99
e] E=1/2*5+1/5*8+1/8*11+1/17*20
g] G=5/2*1+4/1*11+3/11*2+1/2*15+13/15*4
Ai giúp gấp đi ạ !
Tính nhanh
A) B =3/2×5+3/5×8+3/8×11+3/11×14
B)3/1×2+3/2×3+3/3×4+...+3/99×100
C)4 /3×7+4/7×11+4/11×15+4/15×19+4/19×23+4/23×27
D) (1-1/3)×(1-1/4)×(1-1/5)×(1-1/6)×...×(1-1/99)
