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= 4/9 x ( 5/7 + 6/7 - 4/7 )
= 4/9 x 1
= 4/9
tick mình nha
= 4/9 x ( 5/7 + 6/7 - 4/7 )
= 4/9 x 1
= 4/9
tick mình nha
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1 x 2 = 2
4 x 1 = 4
6 x 2 = 12
33 : 11 = 3
3 x 3 = 9
6 x 10 = 60
3 x 9 = 27
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\(d,-\dfrac{3}{26}.\left(-\dfrac{15}{19}\right)+\dfrac{2}{19}.\left(-\dfrac{3}{26}\right)\\=-\dfrac{3}{26}.\left(-\dfrac{15}{19}+\dfrac{2}{19}\right)\\ =-\dfrac{13}{19}.\left(-\dfrac{3}{26}\right)\\ =\dfrac{3}{38}. \)
d) \(\dfrac{-3}{26}\times\left(\dfrac{-15}{19}\right)+\dfrac{2}{19}\times\dfrac{-3}{26}\)
\(=\dfrac{-3}{26}\times\left[\left(\dfrac{-15}{19}\right)+\dfrac{2}{19}\right]\)
\(=\dfrac{-3}{26}\times\dfrac{-13}{19}\)
\(=\dfrac{3}{38}\)
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107 - {38 - [7 x 32 - 24 : 6 + (9 - 7)3]} : 15
= 107 - {38 - [7 x 9 - 4 + 23]} : 15
= 107 - {38 - [63 - 4 + 8]} : 15
= 107 - {38 - [59 + 8]} : 15
= 107 - (38 - 67) : 15
= 107 - (-29) : 15
= 107 - (-1,99)
= 107 + 1,99
= 108,99
107-{38+[7.3^2-24:6+(9-7)^3]}:15
=107-{38+[7.9-24:6+23]} :15
=107-{38+[63-4+8]}:15
=107-{38+67}:15
=107-105:15
=107-7=7