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-26 + ( -15 ) + l -16l + 26
= -26 + ( -15 ) + 16 + 26
= -26 + 26 + ( -15 ) + 16
= 0 + ( -15 ) + 16
= 1
=-3/26(-15/29-2/19)
=-3/26*(-17/19)
=3/26*17/19
=51/494
\(\frac{\left(39+13\right)x2}{\left(84+57\right)x2}=\frac{78+26}{168+104}\)
16 + x + 84 + x với x = 26
Thay x vào phép tính , ta có:
16 + 26 + 84 + 26
= (16 + 84) + (26 x 2)
= 100 + 52
= 152
\(d,-\dfrac{3}{26}.\left(-\dfrac{15}{19}\right)+\dfrac{2}{19}.\left(-\dfrac{3}{26}\right)\\=-\dfrac{3}{26}.\left(-\dfrac{15}{19}+\dfrac{2}{19}\right)\\ =-\dfrac{13}{19}.\left(-\dfrac{3}{26}\right)\\ =\dfrac{3}{38}. \)
d) \(\dfrac{-3}{26}\times\left(\dfrac{-15}{19}\right)+\dfrac{2}{19}\times\dfrac{-3}{26}\)
\(=\dfrac{-3}{26}\times\left[\left(\dfrac{-15}{19}\right)+\dfrac{2}{19}\right]\)
\(=\dfrac{-3}{26}\times\dfrac{-13}{19}\)
\(=\dfrac{3}{38}\)
Ta có: \(D=\frac{\frac{15}{6x16}+\frac{15}{16x26}+\frac{15}{26x36}}{\frac{33}{6x16}-\frac{63}{16x26}+\frac{93}{26x36}}\)
\(\Rightarrow D=\frac{15.\frac{1}{6x16}+15.\frac{1}{16x26}+15.\frac{1}{26x36}}{3.11.\frac{1}{6x16}-3.21.\frac{1}{16x26}+3.31.\frac{1}{26x36}}\)
\(\Rightarrow D=\frac{15.\left(\frac{1}{6x16}+\frac{1}{16x26}+\frac{1}{26x36}\right)}{3.\left(\frac{11}{6x16}-\frac{21}{16x26}+\frac{31}{26x36}\right)}\)
\(\Rightarrow D=5.\left(\frac{1}{6x16}+\frac{1}{16x26}+\frac{1}{26x36}\right):\left(\frac{11}{6x16}-\frac{21}{16x26}+\frac{31}{26x36}\right)\)
\(26.\left(-84\right)+\left(-26\right).15+26=26\left(-84-15+1\right)=26.\left(-98\right)=-2548.\)