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a) 36 x 532 + 63 x 532 + 532
= 532 x (36 + 63 + 1)
= 532 x 100
= 53200
b) 679 + 679 x 123 - 679 x 24
= 679 x (1 + 123 - 124)
= 679 x 0
= 0
c) 245 x 327 - 245 x 18 - 9 x 245
= 245 x (327 - 18 - 9)
= 245 x 300
= 73500
a)
\(36\times532+63\times532+532\)
\(=36\times532+63\times532+532\times1\)
\(=532\times\left(36+63+1\right)\)
\(=532\times100\)
\(=53200\)
b)
\(679+679\times123-679\times24\)
\(=679\times1+679\times123-679\times24\)
\(=679\times\left(1+123-24\right)\)
\(=679\times100\)
\(=67900\)
c)
\(245\times327-245\times18-9\times245\)
\(=245\times\left(327-18-9\right)\)
\(=245\times300\)
\(=73500\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Hướng dẫn giải:
36 x 43 = 1548
123 x 25 = 3075
245 x 34 = 8330
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(123\times35+124\times65\)
\(=123\times35+\left(123+1\right)\times65\)
\(=123\times35+123\times65+65\)
\(=123\times\left(35+65\right)+65\)
\(=123\times100+65\)
\(=12300+65\)
\(=12365\)
123 x 35 + 124 x 65
= 123 x 35 + 123 x 65 + 65
= 123 x (35 + 65) + 65
= 123 x 100 + 65
= 12300 + 65
= 12365
![](https://rs.olm.vn/images/avt/0.png?1311)
Phep so sanh nao dung?
A. 123/124 > 124/125
B. 123/124=124/125
C. 123/124<124/125
D. 123/124 = 124-1/125
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
[1 x 2 x 3 x 4 x........................x100] x [679+679 x 123-679 x124]
= A x [679 x 124-679 x 124]
= A x 0
=0
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 99 + X = 300
\(\Rightarrow\)X x 100 = 300
\(\Rightarrow\)X = 3
X x 123 - 245 = 7012
\(\Rightarrow\)X x 123 = 7257
\(\Rightarrow\)X = 7257 : 123
\(\Rightarrow\)X = 59
X x 124 - 2568 = 5988
\(\Rightarrow\)X x 124 = 8556
\(\Rightarrow\)X = 8556 : 124
\(\Rightarrow\)X = 69
X x 99 + X = 300
X x ( 99 + 1 ) = 300
X x 100 = 300
X = 300 : 100
X = 3
X x 123 - 245 = 7012
X x 123 = 7012 + 245
X x 123 = 7257
X = 7257 : 123
X = 59
X x 124 - 2568 = 5988
X x 124 = 5988 + 2568
X x 124 = 8556
X = 8556 : 124
X = 69