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\(A=\frac{1}{2}×\frac{3}{4}+\frac{1}{4}×\frac{1}{2}\)
\(A=\frac{1}{2}×\left(\frac{3}{4}+\frac{1}{4}\right)\)
\(A=\frac{1}{2}×\left(\frac{3+1}{4}\right)\)
\(A=\frac{1}{2}×1\)
\(A=\frac{1}{2}\)
\(B=\frac{1212}{2121}×\frac{151515}{161616}\)
\(B=\frac{1212:101}{2121:101}×\frac{151515:10101}{161616:10101}\)
\(B=\frac{12}{21}×\frac{15}{16}\)
\(B=\frac{12×15}{21×16}\)
\(B=\frac{3×4×3×5}{3×7×4×4}\)
\(B=\frac{15}{28}\)
(1-1/2)×(1-1/3)×(1-1/4)×(1-1/5)×1-1/6=1/2×2/3×3/4×4/5×5/6=1/6
theo mình nghĩ là
( 112 x 115 ) x ( 113 x 114 ) x 116
sai thì cho xin lỗi nha bn
a: =8/15x1/4=2/15
b: \(=\dfrac{5}{3}\cdot\dfrac{4}{5}\cdot\dfrac{6}{7}=\dfrac{24}{21}=\dfrac{8}{7}\)
c: \(=\dfrac{2}{5}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)=\dfrac{2}{5}\)
`1/3xx 1/2 + 1/2 xx 1/5`
`=1/2 xx (1/3 +1/5)`
`= 1/2 xx ( 5/15 +3/15)`
`= 1/2 xx 8/15`
`= 8/30`
`=4/15`
__
`1/3 xx 1/2 - 1/5 xx 1/2`
`= 1/2 xx (1/3 -1/5)`
`= 1/2 xx ( 5/15 -3/15)`
`=1/2 xx 2/15`
`= 2/30`
`=1/15`
a)
`1/3xx1/2+1/2xx1/5`
`=1/2xx(1/3+1/5)`
`=1/2xx(5/15+3/15)`
`=1/2xx8/15`
`=4/15`
b)
`1/3xx1/2-1/5xx1/2`
`=1/2xx(1/3-1/5)`
`=1/2xx(5/15-3/15)`
`=1/2xx2/15`
`=1/15`
a)\(\frac{1}{2}:\frac{1}{5}+\frac{1}{3}:\frac{1}{5}+\frac{1}{6}:\frac{1}{5}\)
=\(\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{6}\right):\frac{1}{5}\)
=\(1:\frac{1}{5}\)
=5
b)\(\frac{1515\text{×}161616}{151515\text{×}1616}\)
=1