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X x 62 + X x 38 = 4200
X x (62+38)=4200
X=4200:100=42
Đáp số : 42
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62 - 52 + 37 + 28 - 38 + 63
= ( 62 - 52 ) + ( 37 + 63 ) + ( 28 - 38 )
= 10 + 100 + - 10
= 110 + - 10
= 100
\(62-52+37+28-38+63\)
= \(\left(62+28\right)-\left(52+38\right)+\left(37+63\right)\)
= \(90-90+100\)
= \(100\)
![](https://rs.olm.vn/images/avt/0.png?1311)
62 - 52 + 37 + 28 -38 +63 = (62 + 28 ) +(37+63) - 52 - 38
= 90 + 100 -90
=100
62 - 52 + 37 + 28 - 38 + 63 = (62 - 52) + 28 - 38 + (37 + 63)
=38 - 38 + 100
= 0 + 100 = 100
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`#040911`
`a)`
`27 \times 38 + 62 \times 27 - 27 \times 90`
`= 27 \times (38 + 62 - 90)`
`= 27 \times (100 - 90)`
`= 27 \times 10`
`= 270`
\(27\times38+62\times27-27\times90\)
\(=27\times\left(38+62-90\right)\)
\(=27\times\left(100-90\right)\)
\(=27\times10\)
\(=270\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=> x . ( 62 + 38 ) = 4200
=> x . 100 = 4200
=> x = 4200 : 100
=> x = 42
\(x\times62+x\times38=4200\)
\(x\times\left(62+38\right)=4200\)
\(x\times100=4200\)
\(x=4200:100\)
\(x=42\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x=27.38+62.27-27.90\)
\(x=27.\left(38+62-90\right)\)
\(x=27.10\)
\(=270\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) =49x62+62x51
=62x(49+51)
=62x100
=6200
b)còn câu b =3724 nha
12x + 38 = 62
12x= 62 - 38
x = 24
12x = 24 : 12
x = 2
12x + 38 = 62
12x = 62-38
12x = 24
x = 24 : 12
x = 2