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![](https://rs.olm.vn/images/avt/0.png?1311)
a) 22,56 – 7,59 – 8,41 | b) 53,48 – 19,84 – 22,16 |
= 22,56 – (7,59 + 8,41) | = 53,48 – (19,84 + 22,16) |
= 22,56 – 16 | = 53,48 – 42 |
= 6,56. | = 11,48. |
a) 22,56 – 7,59 – 8,41 | b) 53,48 – 19,84 – 22,16 |
= 22,56 – (7,59 + 8,41) | = 53,48 – (19,84 + 22,16) |
= 22,56 – 16 | = 53,48 – 42 |
= 6,56. | = 11,48. |
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 22,56 – 7,59 – 8,41 | b) 53,48 – 19,84 – 22,16 |
= 22,56 – (7,59 + 8,41) | = 53,48 – (19,84 + 22,16) |
= 22,56 – 16 | = 53,48 – 42 |
= 6,56. | = 11,48. |
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3,7\times3,8+6,2\times3,7\\ =3,7\times\left(3,8+6,2\right)\\ =3,7\times10\\ =37\\ 56,8\times76,9-56,8\times76,8\\ =56,8\times\left(76,9-76,8\right)\\ =56,8\times0,1\\ =5,68\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) 2 x 3 x 4 x 8 x 50 x 25 x 125
= 3 x 2 x 50 x 4 x 25 x 8 x 125
= 3 x ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125 )
= 3 x 100 x 100 x 1000
= 30000000
b ) 45 x 128 - 90 x 64
= 45 x ( 2 x 64 ) - 90 x 64
= ( 45 x 2 ) x 64 - 90 x 64
= 90 x 64 - 90 x 64
= 0
a) = (2.50).(4.25).(8.125).3=100.100.1000.3=30000000
b)45.128-90.64=45.128-45.2.64
=45.128-45.128
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=21,37\cdot\left(27,5+72,4+0,1\right)=21,37\cdot100=2137\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=21,37\cdot27.5+72.4+21.37+21.37\cdot0.1\)
\(=21.37\left(27.5+72.4+0.1\right)=21.37\cdot100=2137\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\times\left(0,1+4+2,9+2+1\right)=25,2\)
\(10x=25,2\)
\(x=2,52\)
\(x\times0,1+x\times4+x\times2,9+x\times2+x=25,2\)
\(x\times\left(0,1+4+2,9+2+1\right)=25,2\)
\(x\times10=25,2\)
\(x=25,2:10\)
\(x=2,52\)
tìm x mè giải thích sao :v?
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2 x 3 x 4 x 8 x 50 x 25 x 125
= (2 x 50) x (4 x 25) x (8 x 125) x 3
= 100 x 100 x 1000 x 3
= 30 000 000
b) 45 x 128 90 x 64
= (45 x 64) x 128 90
= 2880 x 128 90
= 37 123 200
_HT_
Tính bằng cách thuận tiện nhất.
22,56 – 7,59 – 8,41 = 6,56 53,48 – 19,84 – 22,16 = 11,48 2,13 x 90 + 2,13 : 0,1= 213
2,162 x 183,08 – 2,162 x 83,08 = 216,2 6,432 x 72,4 + 6,432 x 83,08 = 990,04736
25,64 x 3,8 + 25,64 x 6,2 = 256,4 84,03 x 45,68 – 84,03 x 35,68 = 840,3
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