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x - ( 3,3 + 2,4 ) = 11,6
x - 5,7 =11,6
x = 11,6 + 5,7
x = 17,3
<=>x-5,7=11,6 <=>x-4,6=1,8+2,6
<=>x =11,6+5,7=17,3 <=>x-4,6=4,4
Vậy x=17,3 <=>x =4,4+4,6=9 Vậy x=9
<=>x+1,8=15,02+0,91=15,93 <=>5.x=47-27=20
<=>x =15,93-1,8=14,13 <=>x =20:5=4
Vậy x=14,13 Vậy x=4
<=>x:3=0,312 8.x-3.x=1,95
<=>x =0,312.3 x.5 =1,95
<=>x =0,931 x =1,95:5
Vậy x=0,936 x=0,19 vậy x=0,19
<=>x:2=2,43+8,6=11,03
<=>x =11,03.2= 22,06
Vậy x=22,06
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1:
a: x+2,57=14,25-6,3
=>x+2,57=7,95
=>x=5,38
b: 12,9-x=4,2+2,4
=>12,9-x=6,6
hay x=6,3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{0,4\cdot13,68\cdot0,9 +0,6\cdot48,24\cdot0,6+0,2\cdot38,08\cdot1,8}{5:0,125+8:0,25}\)
Tử số : 0,4 x 13,68 x 0,9 +0,6 x 48,24 x 0,6 + 0,2 x 38,08 x 1,8
= 0,36 x 13,68 + 0,36 x 48,24 + 0,36 x 38,08
= 0,36 x ( 13,68 + 48,24 + 38,08 )
= 0,36 x 100
= 36
Mẫu số : 5 : 0,125 + 8 : 0,25
= 5 x 8 + 8 x 4
= 8 x ( 5 + 4 )
= 8 x 9
= 27
Vậy : \(\frac{0,4\cdot13,38\cdot0,9+0,6\cdot48,24\cdot0,6+0,2\cdot38,08\cdot1,8}{5:0,125+8:0,25}=\frac{36}{27}=\frac{4}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a) \(\dfrac{9}{20}-\dfrac{8}{15}\times\dfrac{5}{12}\)
\(=\dfrac{9}{20}-\dfrac{2}{9}\)
\(=\dfrac{41}{180}\)
b) \(\dfrac{2}{3}\div\dfrac{4}{5}\div\dfrac{7}{12}\)
\(=\dfrac{2}{3}\times\dfrac{5}{4}\times\dfrac{12}{7}\)
\(=\dfrac{5}{6}\times\dfrac{12}{7}\)
\(=\dfrac{10}{7}\)
c) \(\dfrac{7}{9}\times\dfrac{1}{3}+\dfrac{7}{9}\times\dfrac{2}{3}\)
\(=\dfrac{7}{9}\times\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)
\(=\dfrac{7}{9}\times1\)
\(=\dfrac{7}{9}\)
Bài 2:
a) \(2\times\left(x-1\right)=4026\)
\(\left(x-1\right)=4026\div2\)
\(x-1=2013\)
\(x=2014\)
Vậy: \(x=2014\)
b) \(x\times3,7+6,3\times x=320\)
\(x\times\left(3,7+6,3\right)=320\)
\(x\times10=320\)
\(x=320\div10\)
\(x=32\)
Vậy: \(x=32\)
c) \(0,25\times3< 3< 1,02\)
\(\Leftrightarrow0,75< 3< 1,02\) ( S )
=> \(0,75< 1,02< 3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)X + 18,7= 50, 5 :2,5
X +\(\frac{187}{10}\)=\(\frac{505}{10}\):\(\frac{25}{10}\)
X + \(\frac{187}{10}\)=\(\frac{101}{2}:\frac{5}{2}\)
\(X+\frac{187}{10}=\frac{101}{2}\times\frac{2}{5}\)
\(X+\frac{187}{10}=\frac{101}{5}\)
\(X=\frac{101}{5}-\frac{187}{10}\)
\(X=\frac{202}{10}-\frac{187}{10}\)
\(X=\frac{15}{10}\)
\(X=\frac{3}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{6,72-x=(-12,6)+6,3 }\)
\(\text{6,72-x=-6,3}\)
\(\text{ x=13,02}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2:
a: =>x-1/5=2/15
=>x=2/15+3/15=5/15=1/3
b: =>x+7/12=-5/6-2/6=-7/6
=>x=-14/12-7/12=-21/12=-7/4
c: =>x+2/3=-10/3
=>x=-4
d: =>1/4:x=-11/4
=>x=-1/4:11/4=-1/11
e: =>8:x=1,6
=>x=5
![](https://rs.olm.vn/images/avt/0.png?1311)
`a)19,75+6,3=34,25-x:0,4`
`x:0,4=34,25-19,75-6,3`
`x:0,4=8,2`
`x=8,2xx0,4=3,28`
________________________________________________
`b)20,2xx4,3=x xx12,5-88,64`
`x xx12,5=20,2xx4,3+88,64`
`x xx12,5=86,86+88,64=175,5`
`x=175,5:12,5`
`x=14,04`
a: 34,25-x:0,4=19,75+6,3
=>x:0,4=8,2
hay x=3,28
b: =>12,5x-88,64=20,2x4,3
=>12,5x=175,5
hay x=14,04
\(3,5=x:8\)
\(x=3,5.8\)
\(x=28\)
CHÚC BẠN HỌC TỐT!
=28
k cho mik nhá