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a) 2/9 : 2/3 x 1/2
= 2/9 x 3/2 x 1/2
= 6/18 x 1/2
= 6/36
b) 2 + 1/4 x 4/3
= 2 + 4/7
= 2/1(7) + 4/7
= 14/7 + 4/7
= 18/7
c) 3 x 1/2 x 1/4
= 3/1 x 1/2 x 1/4
= 3/2 x 1/4
= 3/8
#Hok_tốt
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\(\dfrac{3}{5}+\dfrac{1}{6}.\dfrac{3}{4}=\dfrac{3}{5}+\dfrac{1}{8}=\dfrac{29}{40}\)
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a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
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\(\frac{2}{3}+\frac{5}{9}-\frac{3}{4}\)
\(=\frac{24}{36}+\frac{20}{36}-\frac{27}{36}\)
\(=\frac{17}{36}\)
\(\frac{2}{7}:\frac{2}{3}-\frac{1}{7}\)
\(=\frac{3}{7}-\frac{1}{7}\)
\(=\frac{2}{7}\)
\(\frac{2}{5}\times\frac{1}{4}:\frac{3}{8}\)
\(=\frac{1}{10}:\frac{3}{8}\)
\(=\frac{8}{30}\)
\(=\frac{4}{15}\)
2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 4 + 4 x 4 + 4 + 4
= (2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 )+(3 + 3 + 3 + 3 + 3 + 3 + 3 + 3)+ ( 4 x 4 )+ (4 + 4 + 4 )
= 16 + 24 + 16 + 12
= 88
mk ko pít đúng hay sai nữa nhưng pạn k cho mk nha pạn
2+2+2+2+2+2+2+2+3+3+3+3+3+3+3+3+4+4x4+4+4
trả lời ......
99.9% làm sai
2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 4 + 4 x 4 + 4 + 4
= (2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 )+(3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 4 + 4 x 4 + 4 + 4 )
= 16 + 56
=72