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![](https://rs.olm.vn/images/avt/0.png?1311)
X-Yx3=Yx3+4,25
X-Yx3-Yx3=4,25
X-Yx(3-3)=4,25
X-Yx0=4,25
=> X=4,25
4,25-Y=2,25
Y=4,25-2,25
Y=2
Bai nay sao de vay?
x=y+2.25
<=> y+2.25 - 3y=3y+4.25
<=> 5y=-2
y=-0.4
x=1.85 bai nay ra am nha
![](https://rs.olm.vn/images/avt/0.png?1311)
y:8+yx8-56,78=138,22
y:8+yx8 =138,22-56,78
y:8+yx8 =81,44
yx8,125 =81,44
y =81,44:8,125
y =10,02...
y : 8 + y \(\times\) 8 - 56,78 = 69,11 \(\times\) 2
y \(\times\) 0,125 + y \(\times\) 8 - 56,78 = 138,22
y \(\times\) ( 0,125 + 8) = 138,22 + 56,78
y \(\times\) 8,125 = 195
y = 195 : 8,125
y = 24
Thử lại ta có:
24 : 8 + 24 \(\times\) 8 - 56,78
= 3 + 192 - 56,78
= 195 - 56,78
= 138,22
= 69,11 \(\times\) 2
Vậy y = 24 là đúng
![](https://rs.olm.vn/images/avt/0.png?1311)
Y x 1 + Y x 2 + Y x 3 + ... + Y x 100 = 12625
Y x (1+2+3+...+100) = 12625
Y x (100+1) x (100:2) = 12625
Y x (101 x 50) = 12625
Y x 5050 = 12625
Y= 12625 : 5050
Y= 2,5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(118,24-\left(y\cdot3+y:5\right)=54,24\)
=>\(\left(y\cdot3+y\cdot0,2\right)=118,24-54,24\)
=>\(y\cdot3,2=64\)
=>\(y=\dfrac{64}{3,2}=20\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(y\text{×}5+y:0,25=81\)
\(y\text{×}5+y\text{×}4=81\)
\(y\text{×}\left(5+4\right)=81\)
\(y\text{×}9=81\)
\(y=81:9\)
\(y=9\)
\(y\text{×}3+y:0,2=64\)
\(y\text{×}3+y\text{×}5=64\)
\(y\text{×}\left(3+5\right)=64\)
\(y\text{×}8=64\)
\(y=64:8\)
\(y=8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 3 + y : 2 = 110
y x 3 + y x 0,5 = 110
y x ( 3 + 0,5 ) = 110
y x 3,5 = 110
y = 110 : 3,5
y = ??????????
![](https://rs.olm.vn/images/avt/0.png?1311)
720:(yx2+yx3)=2x3
720:(yx2+yx3)=6
(yx2+yx3)=720:6
yx2+yx3=120
yx(2+3)=120
yx5=120
y=120:5
y=24
nhé bạn
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