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nhiều thế ren giải được ma bik giải xng rồi có dc chi hông?
\(=\dfrac{14+15}{18}\cdot\dfrac{3}{5}=\dfrac{29}{18}\cdot\dfrac{3}{5}=\dfrac{29}{30}\)
c2
6/11 x 3/7+ 5/11 x 3/7
=18/77+15/77
=33/77 rut gon voi 11 = 3/7
a) ( 7/11 + 5/9 ) x 2
C1 : ( 7/11 + 5/9 ) x 2
= 118/99 x 2
= 236/99
C2 : ( 7/11 + 5/9 ) x 2
= 7/11 x 2 + 5/9 x 2
= 14/11 + 10/9
= 236/99
b) ( 2/3 + 7/9 ) : 2
C1 : ( 2/3 + 7/9 ) : 2
= 13/9 : 2
= 13/18
C2 : ( 2/3 + 7/9 ) : 2
= 2/3 : 2 + 7/9 : 2
= 1/3 + 7/18
= 13/18
a) \(\left(\frac{7}{11}+\frac{5}{9}\right)\times2\)
Cách 1: \(\left(\frac{7}{11}+\frac{5}{9}\right)\times2=\frac{118}{99}\times2=\frac{236}{99}\)
Cách 2: \(\left(\frac{7}{11}+\frac{5}{9}\right)\times2=\frac{7}{11}\times2+\frac{5}{9}\times2=\frac{14}{11}+\frac{10}{9}=\frac{236}{99}\)
b) \(\left(\frac{2}{3}+\frac{7}{9}\right):2\)
Cách 1: \(\left(\frac{2}{3}+\frac{7}{9}\right):2=\frac{13}{9}:2=\frac{13}{18}\)
Cách 2: \(\left(\frac{2}{3}+\frac{7}{9}\right):2=\frac{2}{3}:2+\frac{7}{9}:2=\frac{1}{3}+\frac{7}{18}=\frac{13}{18}\)
a, \(\frac{7}{5}+\frac{9}{7}+\frac{6}{5}+\frac{11}{7}\)
C1: \(\frac{94}{35}+\frac{6}{5}+\frac{11}{7}=\frac{136}{35}+\frac{11}{7}=5\frac{16}{35}\)
C2: \(=\left(\frac{7}{5}+\frac{6}{5}\right)+\left(\frac{9}{7}+\frac{11}{7}\right)=\frac{13}{5}+\frac{20}{7}=5\frac{16}{35}\)
b,
C1 : \(\frac{8}{14}+\frac{2}{11}+\frac{12}{14}+\frac{31}{11}=\frac{4}{7}+\frac{2}{11}+\frac{6}{7}+\frac{31}{11}=\frac{58}{77}+\frac{6}{7}+\frac{31}{11}=\frac{124}{77}+\frac{31}{11}=4\frac{3}{7}\)
C2:
\(\frac{4}{7}+\frac{2}{11}+\frac{6}{7}+\frac{31}{11}=\left(\frac{4}{7}+\frac{6}{7}\right)+\left(\frac{2}{11}+\frac{31}{11}\right)=\frac{10}{7}+3=3\frac{10}{7}=4\frac{3}{7}\)
**** cko t nha , xin xin đó
( 1/10 + 2/9 + 3/8 + 4/7 + 5/6 + 1/6 + 3/7 + 5/8 + 7/9 + 9/10 ) * 48
= [ ( 1/10 + 9/10 ) + ( 2/9 + 7/9 ) + ( 3/8 + 5/8 ) + ( 4/7 + 3/7 ) + ( 5/6 + 1/6 ) ] * 48
=( 1 + 1 + 1 + 1 + ) *48
=5 * 48
= 240
C1 : \(\left(\frac{9}{5}+\frac{3}{2}\right):\frac{7}{6}\)
\(=\frac{33}{10}:\frac{7}{6}\)
\(=\frac{99}{35}\)
C2 :
\(\left(\frac{9}{5}+\frac{3}{2}\right):\frac{7}{6}\)
\(=\frac{9}{5}:\frac{7}{6}+\frac{3}{2}:\frac{7}{6}\)
\(=\frac{54}{35}+\frac{9}{7}\)
\(=\frac{99}{35}\)
~ Chúc học tốt ~
Ai ngang qua xin để lại 1 L - I - K - E
Cách 1 : \(\left(\frac{9}{5}+\frac{3}{2}\right):\frac{7}{6}=\frac{33}{10}:\frac{7}{6}=\frac{33}{10}x\frac{6}{7}=\frac{99}{35}\)
Cách 2 : \(\left(\frac{9}{5}+\frac{3}{2}\right):\frac{7}{6}=\frac{9}{5}:\frac{7}{6}+\frac{3}{2}:\frac{7}{6}=\frac{9}{5}x\frac{6}{7}+\frac{3}{2}x\frac{6}{7}=\frac{54}{35}+\frac{9}{7}=\frac{99}{35}\)