[102+(28-2x)]20=1*5
[102+(28-2x)]20=5
102+(28-2x)=5:20
102+(28-2x)=0.25
28-2x=0.25-102
28-2x=-101.75
2x=28+101.75
2x=129.75
x=129.75:2
x=64.875
1) Tìm x biết:
a) 8x : 2x = 4
b) [ 102 + (28 - 2x)] : 20 - 5 = 1
123-5.(x+4)=38
10+2x=2.(32-1)
2.x-138=23.32
[102+(28-2x)]:20-5=1
231-(x-6)=1339:13
a)1032 : ( x: 4) = 6
b)123-5.(x+4)=38
c)10+2x=2.(32-1)
d)2.x-138=23.32
e)[102+(28-2x)]:20-5=1
f)231-(x-6)=1339:13
g)|x-2|=4+-6-(-5)
h)|x-155|=-223+456
Tìm x
a) -x/27 -1 = 2/3
b) x - 4 = -14/35 : 20/-21
c) x + 2/3 = -1/12 . -4/5
d) 1/5 - 3/5x = -15/14 :20/-21
e) -3/7x = 3/5 . 28/9
f)1/2x + 3/5x = -2/3
Thực hiện phép tính:
A) 7/38 x 9/11 +7/38 x 4/11 -7/38 x 2/11
B) 5/31 x 21/25 + 5/31 x -7/10 - 5/31 x 9/20
C) ( -2/3 + 3/7 ) : 4/5 + (-1/3 + 4/7 ) : 4/5
D) 5/9 : ( 1/11 -5/22 ) + 5/9 : ( 1/15 - 2/3 )
E) 3/14 : 1/28 -13/21 : 1/28 + 29/42 : 1/28 - 8
F) ( -40/51 x 0,32 x17/20) : 64/75
Đây là dấu x ( là nhân ) mọi người nhé
mong mn giúp em ạ
Tính hợp lý nếu có thể:
a) -52 x (-2)2 + (-3)3
b) (-19 - 46) : (-13) - (-52) x (-22)
c) (135 - 35) x (-47) + 53 x (-48 - 52)
d) [(-3)13 : 95 - 73] : (-52) - |-14|
e) -105 : (-15) - 21 - 9 x (-2)3
g) (-51) x (-29) - 131 x 51 + |-102|
h) (83 - 107 - 854) - (107 - 554) + 117
k) (-5)2 x 32 x 53 x (-17) x (-1)2n, n thuộc N
n) -28 x (-19) - (-64) x 28 x 17 x |-28|
m) 73 x (28 - 56) - 28 x (73 + 56)
Tìm x, biết:
a) \(\dfrac{3}{4}x\) - \(\dfrac{7}{12}\) = \(\dfrac{5}{6}\) - \(\dfrac{2}{3}\)
b) -\(\dfrac{5}{x}\) = \(\dfrac{20}{28}\)
c) \(2\dfrac{1}{3}\) : x = 7
d) \(\dfrac{-105}{12}\) < x < \(\dfrac{20}{7}\)
Tìm x
20-2(x+4)=4
(2x-32)-52=102
a) 47 – [(45.24 – 52.12):14] b) 50 – [(20 – 23) : 2 + 34] c) 102 – [60 : (56 : 54 – 3.5)] d) 50 – [(50 – 23.5):2 + 3] e) 10 – [(82 – 48).5 + (23.10 + 8)] : 28 f) 8697 – [37 : 35 + 2(13 – 3)] g) 2011 + 5[300 – (17 – 7)2] h) 695 – [200 + (11 – 1)2] i) 129 – 5[29 – (6 – 1)2] tính nhanh
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