Tính nhanh câu sau:
1997x1996-1/1995x1997+1996
tính 1997x1996-1/1995x1997+1996
\(\dfrac{1997\times1996-1}{1995\times1997+1996}\)
\(=\dfrac{1997\times\left(1995+1\right)-1}{1997\times1995+1996}\)
\(=\dfrac{1997\times1995+1997-1}{1997\times1995+1996}\)
\(=\dfrac{1997\times1995+1996}{1997\times1995+1996}\)
\(=1\)
\(\frac{1997x1996-1}{1995x1997+1996}\)tính nhanh
dấu nhân các bạn nhé
\(\frac{1997x1996-1}{1995x1997+1996}\)
\(=\frac{1997x1996-1}{1995x1997+1997-1}\)
\(=\frac{1997x1996-1}{1997x\left(1995+1\right)-1}\)
\(=\frac{1997x1996-1}{1997x1996-1}\)
\(=1\)( vì tử số = mẫu số )
Tham khảo nha !!!
\(\frac{1997\times1996-1}{1995\times1997+1996}\)
= \(\frac{1997\times\left(1995+1\right)-1}{1995\times1997+1996}\)
= \(\frac{1997\times1995+1997-1}{1995\times1997+1996}\)
= \(\frac{1997\times1995+1996}{1995\times1997+1996}\)= 1
cacban giup minh cau nay duoc ko 13/4-6/15-2/15-14/50+18/24
\(A=\dfrac{1997x1996-1}{1995x1997+1996}\)
\(A=\dfrac{1997\times1996-1}{1995\times1997+1996}=\dfrac{1997\times\left(1995+1\right)-1}{1995\times1997+1996}=\dfrac{1995\times1997+1997-1}{1995\times1997+1996}=\dfrac{1995\times1997+1996}{1995\times1997+1996}=1\)
`A=(1997xx1996-1)/(1995xx1997+1996)`
`=(1997xx(1995+1)-1)/(1995xx1997+1996)`
`=(1997xx1995 +1997-1)/(1995xx1997+1996)`
`= (1997xx1995+1996)/(1995xx1997+1996)`
`=1`
1997x1996-1 /1995x1997+1996
\(\frac{1997x1996-1}{1995x1997+1996}\)
Tính nhanh
a, \(\frac{254x399-145}{254+399x253}\)
b, \(\frac{1997x1996-995}{1995x1997+1002}\)
c, \(\frac{5932+6001x5031}{5932x6001-69}\)
d, \(\frac{1995x1997-1}{1996x1995+1994}\)
a . 254 x 399 - 145 / 254 + 399 x 253 = ( 253 + 1 ) x 399 - 145 / 254 + 399 x 253
= 253 x 399 + 1 x 399 - 145 / 254 + 399 x 253
=253 x 399 + 399 - 145 / 254 + 399 x 253
= 253 x 399 + ( 399 - 145) / 254 + 399 x 253
= 253 x 399 + 254 / 254 + 399 x 253
= 1
b. 1997 x 1996 - 995 / 1995 x 1997 + 1002 = 1997 x ( 1995 + 1 ) - 995 / 1995 x 1997 + 1002
= 1997 x 1995 + 1997 - 1995 / 1995 x 1997 + 1002
= 1997 x 1995 + ( 1997 - 995 ) / 1995 x1997 + 1002
= 1997 x1995 + 1002 / 1995 x 1997 + 1002
= 1
c. 5932 + 6001 x 5031 / 5932 x 6001 - 69 = 5932 + 6001 x 5031 / ( 5031 + 1 ) x 6001 - 69
= 5932 + 6001 x 5031 / 5031 x 6001 + 6001 - 69
= 5932 + 6001 x 5031 / 5031 x 6001 + ( 6001 - 69 )
= 5932 + 6001 x 5031 / 5031 x 6001 + 5932
= 1
d. 1995 x 1997 - 1 / 1996 x 1995 + 1994 = 1995 x ( 1996 + 1 ) - 1 / 1996 x 1995 + 1994
= 1995 x1996 + 1995 - 1 / 1996 x 1995 + 1994
= 1995 x 1996 + ( 1995 - 1 ) / 1996 x 1995 + 1994
= 1995 x 1996 + 1994 / 1996 x 1995 + 1994
= 1
\(\frac{1997x1996-995}{1995x1997+1002}\)
\(\frac{1997x1996-995}{1995x1997+1002}=\frac{1997x\left(1995+1\right)-995}{1995x1997+1002}\)
\(=\frac{1997x1995+1997x1-995}{1995x1997+1002}\)
\(=\frac{1997x1995+1997-995}{1995x1997+1002}\)
\(=\frac{1997x1995+1002}{1995x1997+1002}=1\)
1997×1996-1
1995x1997+1996
Các bạn ơi đó là phân số nhé mình cần câu trả lời gấp ai trả lời được mình tích cho
\(\frac{1997x1996-1}{1995x1997+1996}\)
\(=\frac{1997x\left(1995+1\right)-1}{1997x1996+1996}\)
\(=\frac{1997x1995+1997-1}{1997x1995+1996}\)
\(=\frac{1997x1995+1996}{1997x1995+1996}\)
=1
\(\frac{1997x1996-1}{1995x1997+1996}=\frac{2.1-1}{1.1+1996}=\frac{1}{1997}\)
chắc vậy
\(\frac{1997x1996-1}{1995x1997+1996}\)\(=\frac{1996-1}{1995+1996}\)( rút gọn tử cho mẫu )
= \(\frac{-1}{1995}\)
theo mik thui sai thì thui nha
So sánh với 1:
\(\frac{1997x1996-97}{1995x1997-1000}\)
Các bạn trả lời có lập luận nhé .Thanks
\(\frac{1997.1996-97}{1995.1997-1000}=\frac{1997.1995+1997-97}{1997.1995-1000}=\frac{1997.1995-1000}{1997.1995-1000}=1\)
\(\frac{1997\times1996-97}{1995\times1997-1000}=\frac{1997\times1995+1997-97}{1997\times2995+1000}=\frac{1997\times1995+1000}{1997\times1995+1000}=1\)