a)\(\frac{399x45+55x399}{1995x1996-1991x1995}\)
b)\(\frac{1995x1993-18}{1975x1993x1994}\)
c) 217x ( 63 + 26 ) - 216 x ( 63 + 26 ) - ( 63 - 26 )
d)\(\frac{2012x1999-2011x999}{2012x999+2012}\)
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=\(\frac{399x\left(45+55\right)}{1995x\left(1996-1991\right)}\)
=\(\frac{399x100}{1995x5}\)
=\(\frac{399x4x5x5}{399x5x5}\)
=\(\frac{4}{1}\)
=\(4\)
= \(\frac{17955+21945}{3982020-3972045}\)
= \(\frac{39900}{9975}\)
= \(\frac{7980}{1995}\)
= \(\frac{1596}{399}\)
= \(\frac{532}{133}\)
Aswer : \(\frac{532}{133}\)
ta tim xem hai ve deu co so nhan rieng la bao nieu roi ta tinh gia tri cua ve do roi tinh nhu thuong
399 x 45 + 55 x399
= (45 + 55) x 399
= 100 x 399
= 39900
1995 x 1996 x 1995
= 1995 x ( 1996 - 1991 )
= 1995 x 5
= 9975
Ta có: \(D=\frac{\frac{15}{6x16}+\frac{15}{16x26}+\frac{15}{26x36}}{\frac{33}{6x16}-\frac{63}{16x26}+\frac{93}{26x36}}\)
\(\Rightarrow D=\frac{15.\frac{1}{6x16}+15.\frac{1}{16x26}+15.\frac{1}{26x36}}{3.11.\frac{1}{6x16}-3.21.\frac{1}{16x26}+3.31.\frac{1}{26x36}}\)
\(\Rightarrow D=\frac{15.\left(\frac{1}{6x16}+\frac{1}{16x26}+\frac{1}{26x36}\right)}{3.\left(\frac{11}{6x16}-\frac{21}{16x26}+\frac{31}{26x36}\right)}\)
\(\Rightarrow D=5.\left(\frac{1}{6x16}+\frac{1}{16x26}+\frac{1}{26x36}\right):\left(\frac{11}{6x16}-\frac{21}{16x26}+\frac{31}{26x36}\right)\)
399 X 45 + 55 X 399 1995 X 1996 - 1991X 1995
= 399 X ( 45 + 55 ) = 1995 X ( 1996 - 1991 )
= 399 X 100 = 1995 X 5
= 39900 = 9975
1996 X 1995 - 399 1000 + 1996 X 1994
= 3982020 - 399 = 1000 + 3980024
= 3981621 = 3981024
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