X: 0,25= X x...
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x : 0,25 + x x 0,25 = 3,4
x : 25/100 + x x 0,25 = 3,4
x x 4 + x x 0,25 = 3,4
x x (4 + 0,25 ) = 3,4
x x 4,25 = 3,4
x = 3,4 : 4,25
Tìm x,biết:
a)x*96+x:0,25=48,32
b)x:0,25+x+x*95=73,74
c)x:0,5+x:0,25+x+x*93=35,36
d)x:0,125+x+x*91=78,56
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =>100x=48,32
hay x=0,4832
b: =>4x+x+95x=73,74
=>100x=73,74
hay x=0,7374
c: =>2x+4x+x+93x=35,36
=>100x=35,36
hay x=0,3536
a)Xx96+x:0,25=48,32
Xx96+Xx4 =48,32
X x(96+4) =48,32
Xx 100 =48,32
X =48,32:100
X = 0,4832
b)x:0,25+x+Xx95 =73,74
Xx4 +Xx1+Xx95= 73,74
X x(4+1+95) =73,74
X x 100 =73,74
X =73,74:100
X = 0,7374
c)x:0,5+x:0,25+x+Xx93=35,36
Xx2 + Xx4+Xx1+Xx93=35,36
Xx(2+4+1+93) = 35,36
Xx 100 = 35,36
X =35,36:100
X =0,3536
d)X:0,125+X+Xx91=78,56
Xx 8+Xx1+Xx91=78,56
Xx(8+1+91) =78,56
Xx 100 =78,56
X =78,56:100
X =0,7856
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 0,25x3/4-0,25x0,25+0,25x1/2
=0,25x(3/4-0,25+1/2)
=0,25x1
=0,25
b) 5,68x8+56,8x0,1+56,8:10
=5,68x8+5,68+5,68
=5,68x(8+1+1)
=5,68x10
=56,8
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(x.2,9+x:10=2,4\)
⇔ \(29x+x=24\)
⇔ \(30x=24\)
⇒ \(x=\dfrac{4}{5}\)
b) \(x:0,25-x.0,25=1,8\)
⇔ \(x-\dfrac{x}{16}=\dfrac{9}{20}\)
⇔ \(\dfrac{15x}{16}=\dfrac{9}{20}\)
⇒ \(x=\dfrac{12}{25}\)
\(a,\Rightarrow x\times0,9+x\times0,1=2,4\\ \Rightarrow x\times\left(0,9+0,1\right)=2,4\\ \Rightarrow x\times1=2,4\\ \Rightarrow x=2,4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Gộp lại từng phần :
X : 0,25 + X : 0,25
= X x 2 : ( 0,25 + 0,25 )
= X x 2 : 0,5
Tương tự làm phần còn lại X : 0,1 + x + x : 0,01
Rồi tính x
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=27\left(77+15\right)+27\cdot8\)
\(=27\cdot92+27\cdot8=27\cdot100=2700\)
b: \(=75\cdot89+75\cdot9+2\cdot75=75\left(89+9+2\right)=75\cdot100=7500\)
c: \(=0.25\left(42.9-11.7+0.8\right)=0.25\cdot32=8\)
d: 738 phút=12,3 giờ
![](https://rs.olm.vn/images/avt/0.png?1311)
`a)x xx96+x xx0,25=22,23`
`x xx96+x xx4=22,23`
`x xx(96+4)=22,23`
`x xx10=22,23`
`x=22,23:10=2,223`
`b)x:0,25+x xx95+x=10,23`
`x xx4+x xx95+x=10,23`
`x xx(4+95+1)=10,23`
`x xx10=10,23`
`x=10,23:10=1,023`
a: =>96x+4x=22,23
=>100x=22,23
hay x=0,2223
b: =>4x+95x+x=10,23
=>100x=10,23
hay x=0,1023
![](https://rs.olm.vn/images/avt/0.png?1311)
x/0,25+x*0,25=3,4
x*4+x*1/4=3,4
x*(4+1/4)=3,4
17/4x=3,4
x=3,4:17/4
x=0,8
x/0,25+x*0,25=3,4
x*4+x*1/4=3,4
x*(4+1/4)=3,4
17/4x=3,4
x=3,4:17/4
x=0,8
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
1. $=12,5\times 5+12,5\times 4+12,5$
$=12,5\times (5+4+1)=12,5\times 10=125$
2.
$=(0,4\times 0,25)\times (2\times 50)$
$=0,1\times 100=10$