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\(3,4:0,25+3,4:0,5+3,4\times4\\=3,4:\frac14+3,4:\frac12+3,4\times4\\=3,4\times4+3,4\times2+3,4\times4\\=3,4\times(4+2+4)\\=3,4\times(6+4)\\=3,4\times10\\=34\)
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A, ( X + 1,5 ) + ( X + 3 ) + ( X + 4.5 ) + ......+ ( X + 12 )
= 8X + ( 1,5 + 3 + 4,5 + ....+ 12)
= 8X + 54 = 156
8X = 156
X = 19,5
B, 24,3 + X : 16 - 3,4 = 30,34
24,3 + X : 16 = 30,34 + 3,4 = 33,74
X : 16 = 33,74 - 24,3 = 9,44
X = 9,44 x 16 = 151,04
C, ( X + 5,2 ) : 3,2 = 4,7 ( dư 0,5)
X + 5,2 = 4,7 x 3,2 + 0,5 = 15,54
X = 15,54 - 5,2
X = 10,34
A)
(x + 1,5) + (x + 3 ) + (x + 4,5) + .......... + (x + 12 ) = 156
=> x + 1,5 + x + 3 + x + 4,5 + ..........+ x + 12 = 156
=> (x + x + x + x + x + x + x + x) + ( 1,5 + 3 + 4,5 + 6 + 7,5 + 9 + 10,5 + 12 ) = 156
=> 8 \(\times\) x + (1,5 + 12 ) \(\times\) ( 8 : 2 ) = 156
=> 8\(\times\)x + 13,5 \(\times\) 4 = 156
=> 8\(\times\)x + 54 = 156
=> 8 \(\times\) x = 102
=> x = 102 : 8
=> x = 12,75
B) 24,3 + x : 16 - 3,4 = 30,34
=> 24,3 + x : 16 = 33,74
=> x : 16 = 9,44
=> x = 9,44 \(\times\) 16
=> x = 151,04
C) ( x + 5,2 ) : 3,2 = 4,7 (du 0,5 )
=> ( x + 5,2) \(\times\)4,7= 3,2 + 0,5
=> (x + 5,2 ) \(\times\)4,7 = 3,7
=> x + 5,2 = 3,7 : 4,7
=> x + 5,2 = \(\frac{37}{47}\)
=> x = \(\frac{37}{47}-5,2\)
=> x = \(-\frac{1037}{235}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
câu trả lời:
2/7,1/3,3/5,7/8,4/3.
thấy đúng thì k cho mình nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
a) X + 1/4 = 5/8 + 2/5
X + 1/4 = 41/10
X = 41/10 - 1/4
X = 31/40
b) X : 3/4 = 4/10 - 4/10
X : 3/4 = 0
X = 0
c) X + 3,4 x 2,6 = 4,8 x 5,2
X + 8,84 = 24,96
X = 24,96 : 8,84
X = 48/17
d) X : 1,5 + 1,5 = 0,8N x 2
= bó tay nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 1,2 + y x 4,6 + y x 5,2 = 18
y x ( 1,2 + 4,6 + 5,2 ) = 18
y x 11 = 18
y = 18 : 11
y = \(\dfrac{18}{11}\)
Y x 1,2 + Y x 4,6 + Y x 5,2 = 18
Y x (1,2 + 4,6 + 5,2) = 18
Y x 11 = 18
Y = 18 : 11
Y = \(\dfrac{18}{11}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{22}{5}\)\(:\)\(x\)\(=\)\(\frac{44}{5}\)\(:\)\(\frac{5}{2}\)
\(\frac{22}{5}\)\(:\)\(x\)\(=\)\(\frac{88}{25}\)
\(x\)\(=\)\(\frac{22}{5}\)\(:\)\(\frac{88}{25}\)
\(x\)\(=\)\(\frac{5}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,y\times2,8+5,2\times y=48\\ y\times\left(2,8+5,2\right)=48\\ y\times8=48\\ y=\dfrac{48}{8}=6\\ ---\\ b,y\times12,25-y+y\times2,75=1050\\ y\times\left(12,25-1+2,75\right)=1050\\ y\times14=1050\\ y=\dfrac{1050}{14}=75\)
a: \(y\cdot2,8+y\cdot5,2=48\)
=>\(y\left(2,8+5,2\right)=48\)
=>\(8y=48\)
=>\(y=\dfrac{48}{8}=6\)
b: \(y\cdot12,25-y+y\cdot2,75=1050\)
=>\(y\left(12,25-1+2,75\right)=1050\)
=>\(y\cdot14=1050\)
=>\(y=\dfrac{1050}{14}=75\)
\(y\times3,4-5,2=22\)
\(y\times3,4=22+5,2\)
\(y\times3,4=27,2\)
\(y=27,2\div3,4\)
\(y=8\)
bruh...
Y x 3,4 - 5,2 = 22
Y x 3,4 = 22 + 5,2
Y x 3,4 = 27,2
Y = 27,2 : 3,4
Y = 8