36 x 48/96 x 72
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48 x 27 + 48 + 96 x 36
= 48 x (27 + 1) + 48 x 72
= 48 x 28 + 48 x 72
= 48 x (28 + 72)
= 48 x 100
= 4800 .
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{36\times48}{96\times72}=\frac{36\times48}{48\times2\times36\times2}=\frac{1\times1}{1\times2\times1\times2}=\frac{1}{4}\)
\(\frac{36\times48}{96\times72}=\frac{36\times48}{36\times2\times48\times2}=\frac{1}{4}=0,25\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(72\cdot26+36\cdot48\)
\(=36\cdot2\cdot26+36\cdot48\)
\(=36\cdot52+36\cdot48\)
\(=36\cdot\left(52+48\right)\)
\(=36\cdot100=3600\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A) 4,29 x 1230 - 429 x 2,3
= 429 x 12,3 - 429 x 2,3
= 429 x ( 12,3 - 2,3 )
= 429 x 10
= 4290
B) 30 - 15 + 36 - 18 + 42 - 21 + ... + 96 - 48 + 102 - 51
= ( 15 + 15 ) - 15 + ( 18 + 18 ) - 18 + ... + ( 48 + 48 ) - 48 + ( 51 + 51 ) - 51
= 15 + 18 + 21 + ... + 48 + 51
= [( 51 - 15 ) : 3 + 1] x ( 15 + 51 ) : 2
= [36 : 3 + 1] x 66 : 2
= [12 + 1] x 33
= 13 x 33
= 429
![](https://rs.olm.vn/images/avt/0.png?1311)
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a) x*45-3209=13036
x*45 =13036+3209
x*45 =16245
x =16245:45
x =361
b) x:125*65=4608
x:8125=4608
x =4608*8125
x =37440000
c) x:48:25=374
x:48 =374*25
x:48 =9350
x =9350*48
x =448800
d)12925:x+3247=3522
12925:x =3522-3247
12925:x =275
x =12925:275
x =47
e) 17658:x-178=149
17658:x =149+178
17658:x =327
x =17658:327
x =54
g) 15892:x*96=5568
15892:x =5568:96
15892:x =58
x =15892:58
x =274
h)117504:x:72=48
117504:x =48*72
117504:x =3456
x =117504:3456
x =34
ta lay 72÷36