140:10(x-8)=7 tìm x
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1) 3/4 : x/6 = 75/100
x/6 = 3/4 : 75/100
x/6 = 1
x = 1*6
x = 6
Câu 6: Bạn xem ở đây: http://olm.vn/hoi-dap/question/615090.html
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1.\(\frac{3}{4}:\frac{x}{6}=\frac{75}{100}\) \(\Leftrightarrow\frac{3}{4}.6.\frac{1}{x}=\frac{3}{4}\)
\(\Leftrightarrow\frac{6}{x}=1\)
\(\Leftrightarrow x=\frac{1}{6}\)
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a) 89 - (73 - x) = 20
73 - x = 89 - 20 = 69
x = 73 - 69 = 4
b) 140 : (x-8) = 7
x - 8 = 140 : 7 = 2
x = 8 + 2 = 10
\(a,89-\left(73-x\right)=20\\ 73-x=69\\ x=4\\ b,140:\left(x-8\right)=7\\ x-8=20\\ x=28\)
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137+4 (2x+3)=200(hình như đề bài sai)
200-6(x-5)=140
6(x-5)=200-140
6(x-5)=60
x-5=60:6
x-5=10
x=10+5
x=15
140:(x-8)=7
x-8=140:7
x-8=20
x=20+8
x=28
137+4(2x+3)=200
4(2x+3)=200-137
4(2x+3)=63
2x+3=63:4
2x+3=\(\frac{63}{4}\)
2x=\(\frac{63}{4}\)-3
2x=\(\frac{51}{4}\)
x=\(\frac{51}{4}\):2
x=\(\frac{51}{8}\)
Vậy ...
200-6(x-5)=140
6(x-5)=200-140
6(x-5)=60
x-5=60:6
x-5=10
x=15
Vậy...
140:(x-8)=7
x-8=140:7
x-8=20
x=20+8
x=28
Vậy...
k mik nhé
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Bài làm
a) \(\frac{x}{7}-\frac{3}{7}+\frac{1}{2}=\frac{31}{140}\)
\(\frac{x}{7}=\frac{31}{140}-\frac{1}{2}+\frac{3}{7}\)
\(\frac{x}{7}=\frac{31}{140}-\frac{70}{140}+\frac{60}{140}\)
\(\frac{x}{7}=\frac{21}{140}\)
\(\frac{x}{7}=\frac{3}{20}\)
=> \(x.20=3.7\)
=> \(x=\frac{3.7}{20}\)
=> \(x=\frac{21}{20}\)
Vậy \(x=\frac{21}{20}\)
b) \(\frac{5}{12}+\frac{5}{x}-\frac{1}{8}=\frac{1}{2}\)
\(\frac{5}{x}=\frac{1}{2}+\frac{1}{8}-\frac{5}{12}\)
\(\frac{5}{x}=\frac{12}{24}+\frac{3}{24}-\frac{10}{24}\)
\(\frac{5}{x}=\frac{5}{24}\)
=> \(5.24=5.x\)
=> \(x=\frac{5.24}{5}\)
=> \(x=24\)
Vậy \(x=24\)
# Học tốt #
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1, <=>33+x=45
<=> x = 12
Vậy x=12
2, <=>x+73 =102
<=> x =29
3,x=2
4, -23+x=25<=>x=2
6, x-8=20<=>x=28
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (3x-12) :8 +10= 13
<=> (3x-12):8 = 13-10 = 3
<=> 3x-12 = 3 .8 = 24
<=> 3x = 24+12=36
<=> x=36:3=12
b) (x+5).8-20 = 60
<=> (x+5) .8 = 60+20=80
<=> x+5 = 80:8 = 10
<=> x=10-5 = 5
c) 3.[35+(x-10)]-375 = 0
<=> 3.[35+(x-10)] = 0 +375=375
<=> 35+(x-10) = 375 :3 = 125
<=> x-10 = 125-35=90
<=> x = 90+10 = 100
d) ( 158x+173-24) :35 = 81
<=> 158x+149 = 81 . 35 = 2835
<=> 158x = 2835 -149= 2686
<=> x= 2686 : 158 = 17
e) x - 140 : 35 = 0
<=> x-4 = 0
<=> x=0+4 = 4
(3x - 12 ) : 8 + 10 = 13
(3x - 12 ) : 8 = 13 - 10 = 3
(3x - 12 ) = 3 x 8 = 24
3x = 24 - 12 = 12
x =13 : 3 = 4
( x + 5 )
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 71 - ( 33 + x ) = 26
=> 33 + x = 71 - 26
=> 33 + x = 45
=> x = 45 - 33
=> x = 12
b, 140 : ( x - 8 ) = 7
=> x - 8 = 140 : 7
=> x - 8 = 20
=> x = 20 + 8
=> x = 28
c, 4 ( x + 41 ) = 22 . 102
=> 22 ( x + 41 ) = 202
=> x + 41 = 202 : 22
=> x + 41 = 102
=> x + 41 = 100
=> x = 100 - 41
=> x = 59
d, 11 ( x - 9 ) = 77
=> x - 9 = 77: 11
=> x - 9 = 7
=> x = 7 + 9
=> x 16
\(a.71-\left(33+x\right)=26\)
\(33+x=45\)
\(x=12\)
\(b.140:\left(x-8\right)=7\)
\(x-8=20\)
\(x=28\)
\(c.4\left(x+41\right)=2^2.10^2\)
\(4\left(x+41\right)=4.100\)
\(4\left(x+41\right)=400\)
\(x+41=100\)
\(x=59\)
\(d.11\left(x-9\right)=77\)
\(x-9=7\)
\(x=16\)
140 : 10 ( x - 8 ) = 7
10 ( x - 8 ) = 140 : 7
10 ( x - 8 ) = 20
( x - 8 ) = 20 : 10
x - 8 = 2
x = 2 + 8
x = 10
14(x-8)=7
(x-8)=14:7
x-8=2
x=2+8
x=10
~~~~Học Tốt~~~~