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\(=\frac{7}{19}.\left(\frac{8}{11}+\frac{3}{11}\right)+\frac{12}{19}\)
\(=\frac{7}{19}.1+\frac{12}{19}\)
\(=1\)
\(\frac{7}{19}\).\(\frac{8}{11}\)+\(\frac{7}{19}\).\(\frac{3}{11}\)+\(\frac{12}{19}\)
=\(\frac{7}{19}\).1+\(\frac{12}{19}\)
=1
hok tốt
\(=\dfrac{8}{11}\left(\dfrac{19}{35}+\dfrac{16}{35}\right)-\dfrac{9}{11}=\dfrac{8}{11}-\dfrac{9}{11}=-\dfrac{1}{11}\)
f: \(=\dfrac{7}{19}\left(\dfrac{8}{11}+\dfrac{3}{11}\right)-\dfrac{12}{19}=\dfrac{7}{19}-\dfrac{12}{19}=\dfrac{-5}{19}\)
i: \(=\left(\dfrac{9}{24}-\dfrac{18}{24}+\dfrac{14}{24}\right)\cdot\dfrac{6}{5}+\dfrac{1}{2}=\dfrac{5}{24}\cdot\dfrac{6}{5}+\dfrac{1}{2}\)
=1/4+1/2=3/4
` 7/19 . 8/11 + 3/11 . 7/19 + (-12)/19 `
`= 7/19 . ( 8/11 + 3/11 ) + (-12)/19 `
`= 7/19 . 11/11 + (-12)/19`
`= 7/19 . 1 + (-12)/19 `
`= 7/19 + (-12)/19 `
`= -5/19 `
`( 3/8 + (-3)/4 + 7/12 ) : 5/6 + 1/2`
`= 3/8 + (-3)4 + 7/12 . 6/5 + 1/2`
`= ( 9+(-18) + 14)/24 . 6/5 + 1/2`
`= 5/24 . 6/5 + 1/2`
`= 1/4 + 1/2 `
`= 3/4`
`#3107.101107`
`15 - 203 - (-203)`
`= 15 - 203 + 203`
`= 15 - (203 - 203)`
`= 15`
____
`(-3)*(-19) + 3*(-30-19)`
`= (-3)*(-19) - 3*30 - 3*19`
`= (-3)*(-19 + 30 + 19)`
`= (-3)*30`
`= -90`
65.(-19) + (-19).24 + (-19).11
= ( - 19) . ( 65 + 24 + 11 )
= ( -19) . 100 = -1900