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Lời giải:
$6,25\times x+x+x\times 3,75=49,36$
$x\times (6,25+1+3,75)=49,36$
$x\times 11=49,36$
$x=49,36:11=4,49$
![](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)
a) \(6,25+8,75+3,75+1,25=6,25+3,75+8,75+1,25=10+10=20\)
b) \(7,15:0,5+7,15x9-7,15=7,15x\left(1:0,5+7,19-1\right)=7,15x\left(2+9-1\right)=7,15x10=71,5\)
`@` `\text {Ans}`
`\downarrow`
`a)`
`6,25 + 8,75 + 3,75 + 1,25 `
`= (6,25 + 3,75) + (8,75 + 1,25)`
`= 10 +10 = 20`
`b)`
` 7,15 \div 0,5 + 7,15 \times 9 - 7,15 `
`= 7,15 \times 2 + 7,15 \times 9 - 7,15 \times 1`
`= 7,15 \times ( 2+ 9 - 1)`
`= 7,15 \times 10`
`= 71,5`
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3,75x 5,5 + 4,5 x 3,75
= 3,75 x ( 5,5 + 4,5 )
= 3,75 x 10
= 37,5
b) 17,5 x 9.9 + 17,5 : 10
= 17,5 x 9.9 + 17,5x 0,1
= 17,5 x ( 9,9 + 0,1 )
= 17,5 x 10
= 175
a) 3,75 x 5,5 + 4,5 x 3,75
= 3,75 x ( 5,5 + 4,5 )
= 3,75 x 10
= 37,5
b) 17,5 x 9,9 + 17,5 : 10
= 17,5 x 9,9 + 17,5 x 0,1
= 17,5 x ( 9,9 + 0,1 )
= 17,5 x 10
= 175
![](https://rs.olm.vn/images/avt/0.png?1311)
a. (6,24+1,26):0,75
= 7,5 : 0,75 = 10
b. 30,8 - 6,25 x 14,4 :3
= 30,8 - 9 :3
= 30,8 - 3 = 27,8
Tìm x
3,75 : x = 15 : 10
3,75 : x = 1,5
x = 3,75 : 1,5
x = 2,5
3,2 x X = 22,4 x 8
3,2 x X = 179,2
X = 179,2 : 3,2
X = 56
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
(30 : 7,5 + 0,5 x 3 - 1,5) x (4,5 - 9 : 2)
= (30 : 7,5 + 0,5 x 3 - 1,5) x (4,5 - 4,5)
= (30 : 7,5 + 0,5 x 3 - 1,5) x 0
= 0
câu trên chuẩn
(4,5*16-1,7):4.5*15+2.8
=\(\frac{4,5\cdot16-1.7}{4,5\cdot15+2,8}\)
=\(\frac{4,5\cdot\left(15+1\right)-1.7}{4,5\cdot15+2,8}\)
=\(\frac{4,5\cdot15+4,5-1,7}{4,5\cdot15+2.8}\)
=\(\frac{4,5\cdot15+2,8}{4,5\cdot15+2,8}\)
=1
\(x\div4,5=6\) \(6,25\times x+3,75\times x=30\)
\(x=6\times4,5\) \(x\times\left(6,25+3,75\right)=30\)
\(x=27\) \(x\times10=30\)
\(x=30\div10\)
\(x=3\)
a,
\(x:4,5=6\)
\(x=6\times4,5\)
\(x=27\)
b,
6,25 \(\times\) \(x\) + 3,75\(\times\)\(x\) = 30
\(x\) \(\times\)(6,25 + 3,75) = 30
\(x\) \(\times\) 10 = 30
\(x=30:10\)
\(x=3\)