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a) \(\dfrac{1997x1996-1}{1995x1997+1996}=\dfrac{1997x\left(1995+1\right)-1}{1995x1997+1996}\)
\(=\dfrac{1997x1995+1997-1}{1995x1997+1996}=\dfrac{1997x1995+1996}{1995x1997+1996}=1\)
b) \(\dfrac{1997x1996-995}{1995x1997+1002}=\dfrac{1997x\left(1995+1\right)-995}{1995x1997+1002}\)
\(=\dfrac{1997x1995+1997-995}{1995x1997+1002}=\dfrac{1997x1995+1002}{1995x1997+1002}=1\)
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\(\dfrac{1995\cdot\left(1995+1\right)-1000}{1995\cdot1995+995}\) = \(\dfrac{1995\cdot1995+1995-1000}{1995\cdot1995+995}\)
= \(\dfrac{1995\cdot1995+995}{1995\cdot1995+995}\) = \(1\)
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a)37/53x23/48x535353/373737x242424/232323
=37/53x23/48x53/37x24/23
=851/2544x1272/851
=1/2
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\(\frac{1995\cdot1996-1000}{1995\cdot1995+995}=\frac{1995.1995+1995-1000}{1995.1995+995}=\frac{1995.1995+995}{1995.1995+995}=1\)
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1996x1995-996
----------------------
1000+1996x1994
=(1996-996)x1995
------------------------
(1994+1996)x1000
=1000x1994
------------------------
3990x1000
=1994000
------------------
3990000
=997
--------
1995
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1996 * 1995 - 996 / 1996 * 1994 + 1000
= 1996 * 1994 + ( 1996 - 996 ) / 1996 * 1994 + 1000
= 1996 * 1994 + 1000 / 1996 * 1994 + 1000
= 1
**** cho mink nha !
K qua la bang 1 nha bn !
1996 x 1995 - 996 / 1000 + 1996 x 1994 = 1
D/s : 1
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tất cả đều đặt nhân tử chung bạn ạ
a, 399 x45 + 55x 399 = 399 x (45+55) = 399x 100
1995 x 1996 - 1991x1995= 1995x (1996-1991)=1995 x 5 = 2000 -5= (400 x5) - 1 x 5= 5x (400-1) = 5*399
nên đáp án là bằng 100/5 = 20
hai câu sau làm tương tự , ahihi
theo mình Nguyễn Như Quỳnh làm sai rồi
399 x 45 + 55 x 399 / 1995 x 1996 - 1991 x 1995 = 399 x (45+55) / 1995 x (1996-1991)=399 x 100 / 1995 x 5=399 x 100/ 399x5x5=399x100/399x25=100/25=4
các bạn thấy mình đúng thì k cho mình nha !
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1996 x 1995 - 996 - 1000 - 1996 x 1994
= 1996 x (1995 - 1994) - (996 + 1000)
= 1996 - 1996
= 0
3982015
1995x1996-1000:1995x1995+995=3982015