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![](https://rs.olm.vn/images/avt/0.png?1311)
x : 8 + x * 8 - 56,78 = 69,11 9 * 2
<=> x * 1/8 + x * 8 - 56,78 = 138,22
<=> x * ( 1/8 + 8 ) = 195
<=> x = 195 : ( 1/8 + 8 )
<=> x = 24
Vậy x= 24
Học tốt ^.^ !
x:8+x*8-56.78=69.11*2
x:8+x*8-56.78=138.22
x:8+x*8=138.22+56.78
x:8+x*8=195
x*1/8+x*8=195
x*65/8=195
x =195:65.8
x =24
![](https://rs.olm.vn/images/avt/0.png?1311)
x : 8 + x . 8 - 56,78 = 69,11 . 2
x . 1/8 + x . 8 - 56,78 = 138,22
x . ( 1/8 + 8 ) = 138,22 + 56,78
x . 65/8 = 195
x = 195 : 65/8
x = 24
![](https://rs.olm.vn/images/avt/0.png?1311)
y/8+yx8-56,78=138,22
yx(1/8+8)-56,78=138,22
yx8,125=138,22+56,78
yx8,125=195
y=195:8,125
y=24
Vậy y=24. k mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
y: 8 + y x 8 - 56,78 = 69,11 x 2
yx1/8+yx8-56,78=69,11x2
yx(1/8+8)-56,78=138,22
yx8,125=138,22+56,78
yx8,125=195
y=195:8,125
y=24
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( x - 2,5 ) x 1,2 = 6,216
( x - 2,5 ) = 6,216 : 1,2
( x - 2,5 ) = 5,18
x = 5,18 + 2,5
x = 7,68
b) X : 8 + X x 8 - 56,78 = 69,11 x 2
X : 8 + X x 8 - 56,78 = 138,22
X : 8 + X x 8 = 138,22 + 56,78
X : 8 + X x 8 = 195
X x 1/8 + X x 8 = 195
X x ( 1/8 + 8 ) = 195
X x 65/8 = 195
X = 195 : 65/8
X = 24
c. 7,75 - (0,5X : 5 - 6,2) = 1,75
0,5x:5-6,2=7,75-1,75
0,5x:5-6,2=6
0,5x:5=6+6,2
0,5x:5=12,2
0,5x=12,2x5
0,5x=61
x=61:0,5
x=122
a) ( x - 2,5 ) x 1,2 = 6,216
( x - 2,5 ) = 6,216 : 1,2
( x - 2,5 ) = 5,18
x = 5,18 + 2,5
x = 7,68
b) X : 8 + X x 8 - 56,78 = 69,11 x 2
X : 8 + X x 8 - 56,78 = 138,22
X : 8 + X x 8 = 138,22 + 56,78
X : 8 + X x 8 = 195
X x 1/8 + X x 8 = 195
X x ( 1/8 + 8 ) = 195
X x 65/8 = 195
X = 195 : 65/8
X = 24
c. 7,75 - (0,5X : 5 - 6,2) = 1,75
0,5x:5-6,2=7,75-1,75
0,5x:5-6,2=6
0,5x:5=6+6,
20,5x:5=12,2
0,5x=12,2x5
0,5x=61
x=61:0,5
x=122
![](https://rs.olm.vn/images/avt/0.png?1311)
y : 8 + y x 56,78 = 138,22
y x 0,125 + y x 56,78 = 138,22 ( chuyển : 8 sang x 0,125 vì 8 x 0,125 = 1)
y x ( 0,125 + 56,78 ) = 138,22
y x 56,905 = 138,22
y = 138,22 : 56,905
y = ( tự tính nha)
\(y:8+y.56,78=69,11.2\)
\(y.0,125+y.56,78=138,22\)
\(y.\left(0,125+56,78\right)=138,22\)
\(y.56,905=138,22\)
\(y=138,22:56,905\)
y=(tự tính)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x : 8 + x : 8 - 56,78 = 69,11 x 2
x : 8 + x : 8 - 56,78 = 138,22
x : 8 + x : 8 = 138,22 + 56,78
x : 8 + x : 8 = 195
( x + x ) : 8 = 195
x + x = 195 : 8
x + x = 24,375
x x 2 = 24,375
x = 24,375 : 2
x = 12,1875
x : 8 + x : 8 - 56,78 = 69,11 x 2
x : 8 + x : 8 - 56,78 = 138,22
x : 8 + x : 8 = 138,22 + 56,78
x : 8 + x : 8 = 195
( x + x ) : 8 = 195
x + x = 195 : 8
x + x = 24,375
x x 2 = 24,375
x = 24,375 : 2
x = 12,1875