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1/3 x 5/8 + 5/8 x 2/3 = 5/8 x { 1/3 + 2/3} = 5/8 x 9/9 =5/8 x1=5/8 nhé cho mình 1 tích
chúc bạn học giỏi
a.\(\dfrac{2}{3}\times\dfrac{4}{9}+\dfrac{2}{3}\times\dfrac{5}{9}=\dfrac{2}{3}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{2}{3}\times1=\dfrac{2}{3}\)
b.\(\dfrac{7}{5}\times\dfrac{3}{4}-\dfrac{1}{2}\times\dfrac{3}{4}=\dfrac{3}{4}\times\left(\dfrac{7}{5}-\dfrac{1}{2}\right)=\dfrac{3}{4}\times\dfrac{9}{10}=\dfrac{27}{40}\)
c.\(\left(\dfrac{5}{6}+\dfrac{5}{8}\right)\times\dfrac{2}{3}=\dfrac{35}{24}\times\dfrac{2}{3}=\dfrac{35}{36}\)
a) 2/3 x 4/9 + 2/3 x 5/9
=2/3 x ( 4/9 + 5/9)
= 2/3 x 1
= 2/3
b, 7/5 x 3/4 - 1/2 x 3/4
= ( 7/5 - 1/2 ) x 3/4
= 9/10 x 3/4
= 21/40
c, ( 5/6 + 5/8 ) x 2/3
= 35/24 x 2/3
= 35/36
1200-31/40=47969/40
câu 2 =45/56+25/56=(45+25)/56=70/56=5/4
= 1/5 x (2/8 + 5/8 +1/8)
=1/5 x 1
=1/5
=\(\dfrac{1}{5}\times(\dfrac{2}{8}+\dfrac{5}{8}+\dfrac{1}{8})\)
=\(\dfrac{1}{5}\times\dfrac{8}{8}\)
=\(\dfrac{1}{5}\times1\)
=\(\dfrac{1}{5}\)