( 1975 / 1976 + 2010 / 2011 + 1963 / 1968 ) nhân ( 1 phần 3 - 1 phần 4 - 1 phần 12)
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Sửa đề:
\(\left(\dfrac{1975}{1976}+\dfrac{2010}{2011}+\dfrac{1963}{1968}\right)\times\left(\dfrac{1}{3}-\dfrac{1}{4}-\dfrac{1}{12}\right)\)
\(=\left(\dfrac{1975}{1976}+\dfrac{2010}{2011}+\dfrac{1963}{1968}\right)\times\dfrac{4-3-1}{12}\)
\(=\left(\dfrac{1975}{1976}+\dfrac{2010}{2011}+\dfrac{1963}{1968}\right)\times\dfrac{0}{12}\)
\(=0\)
\(\left(\frac{1975}{1976}+\frac{2010}{2011}+\frac{1963}{1968}\right).\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{12}\right)\)
\(=\left(\frac{1975}{1976}+\frac{2010}{2011}+\frac{1963}{1968}\right).0\)
\(=0\)
\(\left(\frac{1975}{1976}+\frac{2010}{2011}+\frac{1963}{1968}\right).\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{12}\right)\)
\(=\left(\frac{1975}{1976}+\frac{2010}{2011}+\frac{1963}{1968}\right).\left(\frac{4}{12}-\frac{3}{12}-\frac{1}{12}\right)\)
\(=\left(\frac{1975}{1976}+\frac{2010}{2011}+\frac{1963}{1968}\right).0\)
\(=0\)
=(1975/1976+2010/2011+1963/1968)x(4/12-3/12-1/12)
=(1975/1976+2010/2011+1963/1968)x0
=0
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right).....\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right).....\left(1-\frac{2010}{2010}\right).\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right).....\left(1-1\right).\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right)\left(1-\frac{2}{2010}\right)\left(1-\frac{3}{2010}\right)....0.\left(1-\frac{2011}{2010}\right)\)
\(A=0\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...\left(1-\frac{2010}{2010}\right).\left(1-\frac{2011}{2010}\right)\)
\(A=\left(1-\frac{1}{2010}\right).\left(1-\frac{2}{2010}\right).\left(1-\frac{3}{2010}\right)...0.\left(1-\frac{2011}{2010}\right)\)
\(\Rightarrow A=0\)
( Vì 0 nhân với số nào cũng bằng 0 )
(1-1/2) x ( 1-1/3) x (1-1/4) x ..... x (1-1/2011) x (1-1/2012)
= 1/2 x 2/3 x 3/4 x ...... x 2010/2011 x 2011/2012
suy ra loại các nhân tử chung ( ko cần viết phần này )
= 1/2012
chúc học tốt
em mới học lớp 5 có j sai cho em xl
( 1975 / 1976 + 2010 / 2011 + 1963 / 1968 ) x ( 1/3 - 1/4 - 1/12)
= ( 1975/1976 + 2010/2011 + 1963/1968) x ( 4/12 - 3/12 - 1/12)
= ( 1975/1976 + 2010/2011 + 1963/1968) x 0
= 0
\(\left(\dfrac{1975}{1976}+\dfrac{2010}{2011}+\dfrac{1963}{1968}\right)\cdot\left(\dfrac{1}{3}-\dfrac{1}{4}-\dfrac{1}{12}\right)\)
\(=\left(\dfrac{1975}{1976}+\dfrac{2010}{2011}+\dfrac{1963}{1968}\right)\cdot\left(\dfrac{1}{12}-\dfrac{1}{12}\right)\)
\(=\left(\dfrac{1975}{1976}+\dfrac{2010}{2011}+\dfrac{1963}{1968}\right)\cdot0\)
= 0