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a)1/3+1/4+2/3+3/4
=(1/3+2/3)+(1/4+3/4)
=1+1
=2.
b)1/2+1/3-1/5+1/6
=(1/2+1/3+1/6)-1/5
=1-1/5
=4/5
c)2/3x4/5+1/3x4/5
=4/5x(2/3+1/3)
=4/5x1
=4/5
d)2/3x4/5-1/3x4/5
=4/5x(2/3-1/3)
=4/5x1/3
=4/15
\(\frac{3}{22}\times\frac{3}{11}\times22\)
1.\(=\frac{3\times3\times22}{22\times11\times1}\)
\(=\frac{3\times3}{11\times1}\)
\(=\frac{9}{11}\)
2. \(=\frac{9}{242}\times22\)
\(=\frac{198}{242}\)
\(=\frac{9\times2\times11}{2\times11\times11}\)
\(=\frac{9}{11}\)
\(\left(\frac{1}{2}+\frac{1}{3}\right)\times\frac{2}{5}\)
1.\(=\frac{5}{6}\times\frac{2}{5}\)
\(=\frac{5\times2}{3\times2\times5}\)
\(=\frac{1}{3}\)
2.\(\)\(=\frac{1}{2}\times\frac{2}{5}+\frac{1}{3}\times\frac{2}{5}\)
\(=\frac{1}{5}+\frac{2}{15}\)
\(=\frac{3}{15}+\frac{2}{15}\)
\(=\frac{5}{15}=\frac{1}{3}\)
Have a good day
a) 2 x 3/4 + 2 x 1/4 = 2 x (3/4 + 1/4)
= 2 x 1
= 2
b) 3 x 2/3 - 3 x 1/3 = 3 x (2/3 - 1/3)
= 3 x 1/3
= 1
a) Cách 1
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\frac{8}{15}.\frac{3}{2}+\frac{7}{15}.\frac{3}{2}\)
\(=\frac{4}{5}+\frac{7}{10}=\frac{3}{2}\)
Cách 2
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\left(\frac{8}{15}+\frac{7}{15}\right).\frac{3}{2}\)
\(=1.\frac{3}{2}=\frac{3}{2}\)
a) C1: 8/15 : 2/3 + 7/15 : 2/3
= 4/5 + 7/10
= 3/2
C2: 8/15 : 2/3 + 7/15 : 2/3
= ( 8/15 + 7/15 ) : 2/3
= 1 : 2/3
= 3/2
b) C1: 4/9 x 3/5 + 5/9 x 3/5
= 4/15 + 1/3
= 3/5
C2: 4/9 x 3/5 + 5/9 x 3/5
= ( 4/9 + 5/9 ) x 3/5
= 1 x 3/5
= 3/5
Chúc bạn học tốt :)
c1 {3/4+1/2}*5/7
=5/4*5/7
=25/28
c2 {3/4+1/2}*5/7
= 3/4*5/7+1/2*5/7
=15/28+5/14
=25/28
