7/13:(-14)-{-2và2/9:(-1và4/9)}
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\(3x2\dfrac{2}{9}:5\)
= \(3x\dfrac{20}{9}:5\)
= \(\dfrac{20}{3}:5=\dfrac{4}{3}\)
\(A=\frac{-3}{7}+\frac{14}{23}+\frac{-14}{17}+\frac{9}{23}-\frac{5}{19}\)
\(\Rightarrow A=-\frac{3}{7}+\left(\frac{14}{23}+\frac{9}{23}\right)-\frac{14}{17}-\frac{5}{19}\)
\(\Rightarrow A=\frac{-3}{7}+1-\frac{14}{17}-\frac{5}{19}\)
Tính nốt nhé
\(B=\frac{5}{9}.\frac{7}{13}.\frac{5}{9}.\frac{9}{13}.\left(-\frac{5}{13}\right).\frac{3}{9}\)
Tương tự câu A
\(\frac{7}{13}.\frac{5}{9}+\frac{7}{13}.\frac{8}{9}-\frac{14}{26}.\frac{13}{9}\)
\(=\frac{7}{13}.\frac{5}{9}+\frac{7}{13}.\frac{8}{9}-\frac{7}{13}.\frac{13}{9}\)
\(=\frac{7}{13}.\left(\frac{5}{9}+\frac{8}{9}-\frac{13}{9}\right)\)
\(=\frac{7}{13}.0\)
\(=0\)
_Chúc bạn học tốt_
a: =35/17-18/17-9/5+4/5
=1-1=0
b: =-7/19(3/17+8/11-1)
=7/19*18/187=126/3553
c: =26/15-11/15-17/3-6/13
=1-6/13-17/3
=7/13-17/3=-200/39
\(\dfrac{14}{7}>\dfrac{9}{7}\)
\(\dfrac{6}{13}< 1\)
\(\dfrac{7}{9}=\dfrac{14}{18}\)
\(\dfrac{4}{9}=\dfrac{20}{45}< \dfrac{26}{45}\)
\(\dfrac{11}{24}>\dfrac{9}{24}=\dfrac{3}{8}\)
\(\dfrac{42}{91}=\dfrac{42:7}{91:7}=\dfrac{6}{13}< \dfrac{7}{13}\)
\(\dfrac{34}{64}< \dfrac{52}{64}=\dfrac{13}{16}\)
\(\dfrac{17}{30}>\dfrac{16}{30}=\dfrac{8}{15}\)
a, \(\dfrac{5}{9}.\dfrac{10}{11}+\dfrac{5}{9}.\dfrac{14}{11}-\dfrac{5}{9}.\dfrac{15}{11}=\dfrac{5}{9}.\left(\dfrac{10}{11}+\dfrac{14}{11}-\dfrac{15}{11}\right)=\dfrac{5}{9}.\dfrac{9}{11}=\dfrac{5}{11}\)
b, \(\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{3}{13}.\dfrac{6}{7}\)\(=\dfrac{6}{7}.\left(\dfrac{8}{13}-\dfrac{3}{13}\right)+\dfrac{6}{13}.\dfrac{9}{7}=\dfrac{6}{7}.\dfrac{5}{13}+\dfrac{54}{91}=\dfrac{30}{91}+\dfrac{54}{91}=\dfrac{84}{91}=\dfrac{12}{13}\)
Bạn ơi, gõ latex cho dễ nhìn nhé!
=(19/13+7/13)+(1/9+4/9+17/9)+7/8
=2+22/9+7/8
=2+239/72
=383/72
k nha
ai k đúng cho mmk thì mk sẽ trả lại gấp đôi và ngược lại
ai ghé qua xinddeer lại 1 k nha
ủng hộ mk với
\(\frac{19}{13}+\frac{14}{16}+\frac{1}{9}+\frac{4}{9}+\frac{7}{13}+\frac{17}{9}\)
\(< =>\left(\frac{19}{13}+\frac{7}{13}\right)+\left(\frac{1}{9}+\frac{4}{9}+\frac{17}{9}\right)+\frac{14}{16}\)
\(< =>2+\frac{22}{9}+\frac{14}{16}\)
\(< =>\frac{40}{9}+\frac{14}{16}\)
\(< =>\frac{383}{72}\)
\(\dfrac{7}{13}:\left(-14\right)-\left(-2\dfrac{2}{9}\right):\left(-1\dfrac{4}{9}\right)\)
\(=\dfrac{7}{13}.\left(-\dfrac{1}{14}\right)-\left(-\dfrac{20}{9}\right):\left(-\dfrac{13}{9}\right)\)
\(=-\dfrac{1}{26}-\left(-\dfrac{20}{9}\right).\left(-\dfrac{9}{13}\right)\)
\(=-\dfrac{1}{26}-\dfrac{20}{13}=\dfrac{-1-40}{26}=-\dfrac{41}{26}\)