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`5 xx 74 xx 2 = 5xx 2 xx 74 = 10xx74 = 740`
`4xx196xx5 = 4xx5xx196 = 20xx196 = 3920`
`(50 + 25)xx4 = 50xx4 + 25xx4 = 200 + 100 = 300`
`125xx(80+8) = 125xx80 + 125xx8 = 10000 + 1000 = 11000`
![](https://rs.olm.vn/images/avt/0.png?1311)
3570:357-10=0 nha
mà số nào nhân với 0 cũng băng 0
suy ra kết quả =0
HT
k cho mình nha
@@@@@@@@@@@
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
57 \(\times\) 46 + 57 \(\times\) 54
= 57 \(\times\) ( 46 + 54)
= 57 \(\times\) 100
= 5700
137 + 355 + 63 + 45
= ( 137 + 63) + ( 355 + 45)
= 200 + 400
= 600
215 \(\times\) 48 - 215 \(\times\) 38
= 215 \(\times\) ( 48 - 38)
= 215 \(\times\) 10
= 2150
4 \(\times\) 50 \(\times\) 25
= ( 4 \(\times\) 25) \(\times\) 50
= 100 \(\times\) 50
= 5 000
57×(46+54) =57×100=5700
137+355+63+45=(137+63) +(355+45) =200+400=600
215×48-215×38=215×(48-38) =215×10=2150
4×50×25=(4×25) ×50=100×50=5000
![](https://rs.olm.vn/images/avt/0.png?1311)
378 x 46 + 189 x 72 - 4 x 78 x 25
= 17388 + 13608 - ( 4 x 25 ) x 78
= 17388 + 13608 - ( 100 x 78 )
= 17388 + 13608 - 7800
= ( 17388 - 7800 ) + 13608
= 9588 + 13608
= 23196
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2345 x 25 x 2345 x 74 + 2345
= 2345 x ( 25 + 74 + 1 )
= 2345 x 100 = 234 500
2345 x 25 x 2345 x74 +2345
=2345 x 25 x2345 x 74 +2345 x 1
= 2345 x ( 25+74 +1 )
=2345 x 100
=234500
![](https://rs.olm.vn/images/avt/0.png?1311)
b. 2 x 8 x 50 x 25 x 125 = (2 × 50) × (8 × 125) × 25
= 100 × 1000 × 25
= 100000 × 25
= 2500000
= ( 2x50) x ( 8x125) x 25
= 100 x 1000 x 25
100000 x 25
= 2500000
\(357.25+357.74+357\)
\(=357.\left(25+74+1\right)\)
\(=357.100\)
\(=35700\)
\(56.497-46.497\)
\(=497.\left(56-46\right)\)
\(=497.10\)
\(=4970\)
\(50.106.2\)
\(=106.\left(50.2\right)\)
\(=106.100\)
\(=10600\)
357 x 25 + 357 x 74 + 357
= 357 x 25 + 357 x 74 + 357 x 1
= 357 x ( 25 + 74 + 1 )
= 357 x 100 = 35700
56 x 497 - 46 x 497
= 497 x ( 56 - 46 )
= 497 x 100 = 49700
50 x 106 x 2
= ( 50 x 2 ) x 106
= 100 x 106 = 10600