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![](https://rs.olm.vn/images/avt/0.png?1311)
x.0,9 = 4-0,022
x.0,9= 3,978
x= 4,42
4,27 - x = 13,5 : 45
4,27 - x = 0,3
x = 3,97
x: 0,1 + x : 0,01 = 2,2
x : ( 0,1+ 0,01)=2,2
x : 0,11= 2,2
x = 0,242
x *0,9=3,978
x =3,978/0,9
x =4,42
4,27-x=13,5/45
4,27-x=0,3
x=4,27-0,3
x=3,97
x/0,1+x/0,01=2,2
x/0,11=2,2
x=2,2x0,11
x=0,242
3,75+1,25*x=4
1,25*x=4-3,75
1,25*x=0,25
x=0,25/1,25
x=0,2
3,75+1,25 *x=3/4
3,75+1,25*x=0,75
1,25*x=0,75-3,75
1,25*x=-3
x=-3/1,25
x=-2,4
![](https://rs.olm.vn/images/avt/0.png?1311)
1,25xX+3,75xX=10
Xx(1,25+3,75)=10
Xx5=10
X=10:5
X=2
![](https://rs.olm.vn/images/avt/0.png?1311)
5 *x + 3,75 *x + 1,25 *x= 20
<=>x* (5+3,75+1,25) =20
<=>x* 10 =20
<=>x = 20:10
<=>x =2
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1 : Tính :
a)\(\frac{6}{5}\)x 4,7 - 3,2
= 5,64 - 3,2
= 2,44
b) 17,6 x 6,7 + 3,2
= 117,92 + 3,2
= 121,12
Bài 2 :
a) 0,8 x 2,5 x 1,25
= ( 0,8 x 1,25 ) x 2,5
= 1 x 2,5
= 2,5
b) 4 x 5,6 x 2,5
= ( 4 x 2,5 ) x 5,6
= 10 x 5,6
= 56
c) 4,65 x 5,6 + 5,6 + 5,6 x 4,35
= 4,65 x 5,6 + 5,6 x 1 + 5,6 x 4,35
= 5,6 x ( 4,65 + 1 + 4,35 )
= 5,6 x 10
= 56
1.
\(\frac{6}{5}\)x \(4,7-3,2\)\(=5,64-3,2=2,44\)
\(17,6\)x \(6,7+3,2\)\(=117,92+3,2=121,12\)
2.
\(0,8\)x \(2,5\)x \(1,25\)\(=\)\(1,25\)x \(0,8\)x \(2,5\)\(=\)\(1\)x \(2,5\)\(=2,5\)
\(4\)x \(5,6\)x \(2,5\)\(=\)\(4\)x \(2,5\)x \(5,6\)\(=\)\(10\)x \(5,6\)\(=\)\(56\)
\(4,65\)x \(5,6\)+ \(5,6\)+ \(5,6\)x \(4,35\)= \(5,6\)x \(\left(4,65+1+4,35\right)\)= \(5,6\)x \(10\)= \(56\)
Nếu đúng thì cho mình 1 k mình nhé :)
Chúc bạn học tốt :)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(210:x=2,1:0,25=8,4\)
\(x=210:8,4=25\)
b) \(x.2+x.0,5=6,25\)
\(2,5x=6,25\)
\(x=6,25:2,5=2,5\)
c) \(x:0,25-x=15,6\)
\(3x=15,6\)
\(x=5,2\)
d) \(x:12,5=3,75.4=15\)
\(x=15.12,5=187,5\)
e) \(x.12,6-x.5,6=42\)
\(7x=42\)
\(x=6\)
g) \(x:0,1-x:4-x.0,75=2,25\)
\(10x-\dfrac{x}{4}-\dfrac{3x}{4}=2,25\)
\(9x=2,25\)
\(x=0,25\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5 x X + 3,75 x X + 1,25 x X = 20
X x (5+3,75+1,25) =20
X x 10 =20
X=20:10
X=2
5 x \(x\)+3,75 x \(x\)+1,25 x \(x\)=20
=> \(x\)x(5+3,75+1,25)=20
=>\(x\)x 10=20
=>x=20:10
=> x=2
vậy \(x\)=2
giúp mình nhé