x chia 3/5 = 12/5 chia x
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
7 tháng 2 2022
Bài 1:
a: \(x=\dfrac{2}{3}:\dfrac{3}{5}=\dfrac{2}{3}\cdot\dfrac{5}{3}=\dfrac{10}{9}\)
b: \(x=\dfrac{17}{8}:\dfrac{7}{17}=\dfrac{17}{8}\cdot\dfrac{17}{7}=\dfrac{289}{56}\)
c: \(x=-\dfrac{3}{4}:\dfrac{7}{12}=\dfrac{-3}{4}\cdot\dfrac{12}{7}=\dfrac{-63}{28}=-\dfrac{9}{4}\)
d: \(\Leftrightarrow x\cdot\dfrac{1}{6}=\dfrac{3}{8}-\dfrac{1}{4}=\dfrac{1}{4}\)
hay \(x=\dfrac{1}{4}:\dfrac{1}{6}=\dfrac{3}{2}\)
e: \(\Leftrightarrow\dfrac{1}{2}:x=-4-\dfrac{1}{3}=-\dfrac{17}{3}\)
hay \(x=-\dfrac{1}{2}:\dfrac{17}{3}=\dfrac{-3}{34}\)
28 tháng 6 2021
`**x in NN`
`a)x+12 vdots x-4`
`=>x-4+16 vdots x-4`
`=>16 vdots x-4`
`=>x-4 in Ư(16)={+-1,+-2,+-4,+-16}`
`=>x in {3,5,6,2,20}` do `x in NN`
`b)2x+5 vdots x-1`
`=>2x-2+7 vdots x-1`
`=>7 vdots x-1`
`=>x-1 in Ư(7)={+-1,+-7}`
`=>x in {0,2,8}` do `x in NN`
`c)2x+6 vdots 2x-1`
`=>2x-1+7 vdots 2x-1`
`=>7 vdots 2x-1`
`=>2x-1 in Ư(7)={+-1,+-7}`
`=>2x in {0,2,8,-6}`
`=>x in {0,1,4}` do `x in NN`
`d)3x+7 vdots 2x-2`
`=>6x+14 vdots 2x-2`
`=>3(2x-2)+20 vdots 2x-2`
`=>2x-2 in Ư(20)={+-1,+-2,+-4,+-5,+-10,+-20}`
Vì `2x-2` là số chẵn
`=>2x-2 in {+-2,+-4,+-10,+-20}`
`=>x-1 in {+-1,+-2,+-5,+-10}`
`=>x in {0,2,3,6,11}` do `x in NN`
Thử lại ta thấy `x=0,x=2,x=6` loại
`e)5x+12 vdots x-3`
`=>5x-15+17 vdots x-3`
`=>x-3 in Ư(17)={+-1,+-17}`
`=>x in {2,4,20}` do `x in NN`
28 tháng 6 2021
a) Ta có: \(x+12⋮x-4\)
\(\Leftrightarrow16⋮x-4\)
\(\Leftrightarrow x-4\inƯ\left(16\right)\)
\(\Leftrightarrow x-4\in\left\{1;-1;2;-2;4;-4;8;-8;16;-16\right\}\)
hay \(x\in\left\{5;3;6;2;8;0;12;-4;20;-12\right\}\)
Vậy: \(x\in\left\{0;5;3;6;2;8;20\right\}\)
b) Ta có: \(2x+5⋮x-1\)
\(\Leftrightarrow7⋮x-1\)
\(\Leftrightarrow x-1\in\left\{1;-1;7;-7\right\}\)
hay \(x\in\left\{2;0;8;-6\right\}\)
Vậy: \(x\in\left\{0;2;8\right\}\)
c) Ta có: \(2x+6⋮2x-1\)
\(\Leftrightarrow7⋮2x-1\)
\(\Leftrightarrow2x-1\inƯ\left(7\right)\)
\(\Leftrightarrow2x-1\in\left\{1;-1;7;-7\right\}\)
\(\Leftrightarrow2x\in\left\{2;0;8;-6\right\}\)
hay \(x\in\left\{1;0;4;-3\right\}\)
Vậy: \(x\in\left\{0;1;4\right\}\)
d) Ta có: \(3x+7⋮2x-2\)
\(\Leftrightarrow6x+14⋮2x-2\)
\(\Leftrightarrow20⋮2x-2\)
\(\Leftrightarrow2x-2\in\left\{1;-1;2;-2;4;-4;5;-5;10;-10;20;-20\right\}\)
\(\Leftrightarrow2x\in\left\{3;1;4;0;6;-2;7;-3;12;-8;22;-18\right\}\)
\(\Leftrightarrow x\in\left\{\dfrac{3}{2};\dfrac{1}{2};2;0;3;-1;\dfrac{7}{2};-\dfrac{3}{2};6;-4;11;-9\right\}\)
Vậy: \(x\in\left\{2;0;3;6;11\right\}\)
e) Ta có: \(5x+12⋮x-3\)
\(\Leftrightarrow27⋮x-3\)
\(\Leftrightarrow x-3\in\left\{1;-1;3;-3;9;-9;27;-27\right\}\)
\(\Leftrightarrow x\in\left\{4;2;6;0;12;-6;30;-24\right\}\)
Vậy: \(x\in\left\{4;2;6;0;12;30\right\}\)
4 tháng 10 2015
12 + 14 + 16 + x chia hết cho 2
12 ; 14 ; 16 chia hết cho 2 => x chia hết cho 2
12 + 14 + 16 không chia hết cho 2
12 ; 14 ; 16 chia hết cho 2 => x không chia hết cho 2 (lẻ)
14 tháng 6 2023
a: =7/8:(2/9-18+1/36)-5/12
=-7/142-5/12=-397/852
b: =3/7(4/9+5/9:6/12)=2/3
c: =5^8(16/31-47/31)+1/3=-5^8+1/3
d: =7/2(3/8+5/8:4/15)=609/64
14 tháng 2 2022
a: =>x=5/6-3/4=10/12-9/12=1/12
b: =>x=12-3/5=57/5
c: =>x=3/5+5/7=21/35+25/35=46/35
d: =>x=7/9:3=7/27
e: =>x=7/8x12/5=84/40=21/10
f: =>x=13:5/3=39/5
11 tháng 7 2019
a) (x.7 +8):5=10
x.7 +8= 10.5=50
x.7= 50-8=42
x= 42:7=6
b) 280: (7+3.x)=4
7+3.x= 4.280= 1120
3.x= 1120-7 =1113
x= 1113: 3= 371
c) (x.5) .19:13= 57
(x.5). 19= 57.13= 741
x.5= 741: 19= 39
x= 39:5 =7,8
d) 6.(28-8).x = 72
20.x= 72:6= 12
x= 12: 20= 0,6
e) 4. (36-4.x)= 3,2
36-4.x= 32:4= 0,8
-4.x= 0,8- 36= -35,2
x= -35,2 : -4 = 8,8
f) (x-15).3 :12= 6
(x-15).3 = 6. 12= 72
x-15= 72: 3= 24
x= 24+ 15= 39
g) (x:4+ 6) . 7 = 70
x:4+6= 70:7= 10
x:4= 10-6= 4
x= 4.4 = 16
h) (x:2+50) :5= 12
x:2+ 50= 12.5= 60
x:2= 60-50= 10
x= 10.2=20
l) 5.(7+3.x)= 140
7+3.x= 140:5 = 28
3.x= 28-7 =21
x= 21: 3= 7
k cho mình nhe
=> 5X/3=12/5X => 25X=36 => X=36/25