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a). 125 x 12 + 12 x 874 + 12
=(125+874+1)x12
=1000x12
=12000
b). 34,64 x 46 + 34,64 x 53 + 34,64
=34,64x(46+53+1)
=34,64x100
=3464
c). 456 x 45 + 456 x 10 – 456 x 55
=456x(45+10-55)
=456x0
=0
a) 125 x12 +12 x 874 + 12 x 1
=12 x (125 + 874 + 1)
=12 x 1000
=12000
b)34,64 x 46 + 34,64 x 53 +34,64 x 1
=34,64 x (46 + 53 + 1)
=34,64 x 100
=3464
c) 456 x 45 +456 x 10 - 456 x 55
=456 x (45 +10 - 55)
=456 x 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
`34,64 xx 46 + 34,64 xx 53 + 34,64`
`=34,64 xx 46 + 34,64 xx 53 + 34,64 xx 1`
`= 34,64 xx (46 + 53 +1)`
`= 34,64 xx 100`
`=3464`
![](https://rs.olm.vn/images/avt/0.png?1311)
123,45 + 23,56 +76,44 + 54,55
= (123,45 + 54,55) + (23,56 + 76,44)
= 178 + 100
= 278
456 x 45 + 456 x 10 + - 456 x 55
=456 x (45 +10-55)
=456 x 0
=0
2,5 x 8,5 + 7,5 x 8,5
=8,5 x (2,5 +7,5)
= 8,5 x 10
= 85
86 x 5 + 86 x 4 + 86
= 86 x (5+4+1)
= 86 x10
860
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 24 x ( 3 + 5)
= 24 x 3 + 24 x 5
= 72 + 120
= 192
or:
24 x ( 3+5)
= 24 x 8
= 192
Mấy phần kia tương tự bạn nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
Xx45x93x45x20x94x52x45x32x8=Xx456x239x512x3645x2554x879x12
khi X nhân với các số bé=X nhân với số các lớn
vậy X chỉ có thể là:0
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(42\times43+43\times57+43\right)-360:4\)
\(=43\times\left(42+57+1\right)-90\)
\(=43\times100-90\)
\(=4300-90\)
\(=4210\)
b) \(\left(372-19\times4\right)+\left(981:9-13\right)\)
\(=\left(4\times93-19\times4\right)+\left(109-13\right)\)
\(=4\times\left(93-19\right)+109-13\)
\(=4\times74+109-13\)
\(=296+109-13\)
\(=392\)
c) \(456:2\times18+456:3-102\)
\(=456\times\frac{1}{2}\times18+456\times\frac{1}{3}-102\)
\(=456\times\left(\frac{1}{2}\times18+\frac{1}{3}\right)-102\)
\(=456\times\left(9+\frac{1}{3}\right)-102\)
\(=456\times\frac{28}{3}-102\)
\(=4256-102\)
\(=4154\)
ko bk tính nhanh!
a)( 42 x 43 + 57+43 ) - 360 :4 b) (372 - 19 x 4 ) + ( 981 : 9 - 13 )
= 43 x (42 + 57 +1 ) - 90 = (372 - 76 ) + ( 109 - 13)
= 43 x 100 - 90 = 296 + 96
= 4300 - 90 = 392
= 4210
![](https://rs.olm.vn/images/avt/0.png?1311)
\(123\cdot456+456\cdot321-256\cdot444\)
\(=\left(123+321\right)\cdot456-256\cdot444\)
\(=444\cdot456-256\cdot444\)
\(=444\cdot\left(456-256\right)\)
\(=444\cdot200\)
\(=88800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
104 \(\times\) 125
= 13 \(\times\) 8 \(\times\) 125
= 13 \(\times\) (8 \(\times\) 125)
= 13 \(\times\) 1000
= 13 000
b, 22 \(\times\) 45
= 2 \(\times\) 11 \(\times\) 5 \(\times\) 9
= (2 \(\times\) 5) \(\times\) (11 \(\times\) 9)
= 10 \(\times\) 99
= 990
c, 50 \(\times\) 12
= 50 \(\times\) 2 \(\times\) 6
= 100 \(\times\) 6
= 600
d, 250 \(\times\) 16
= 250 \(\times\) 4 \(\times\) 4
= 1000 \(\times\) 4
= 4000
a). 125 x 12 + 12 x 874 + 12
= 12 x (125 + 874 + 1)
= 12 x 1000
=12 000
mink chỉ bít câu a) thôi nha
12 x ( 125 + 874 ) = 12 x 999
= 11988