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4/5 x 15/11 x 2/9 = 8/33
4/7 x 2/5 + 4/7 x 3/5 = 4/7
( 5/7 + 7/8 ) x 2 = 89/28
2/14 + 3/7 - 3/14 x 2 = 1/7
tk mình nhé, mk nhanh nhất
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107616 : 236 x 203=456 x 203 =92568
( 11/14 - 7/9 ) + 4/5 = 1/126 + 4/5 =509/630
sai thì thôi nha bạn
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\(a:=\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{1}{5}+\dfrac{2}{5}\right)\\ =1+\dfrac{3}{5}=1\dfrac{3}{5}\\ b:=\left(\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{5}{14}+\dfrac{3}{14}\right)\\ =\dfrac{3}{7}+\dfrac{8}{14}\\ =\dfrac{3}{7}+\dfrac{4}{7}=1\)
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\(a;\frac{11}{14}-\frac{5}{7}=\frac{11}{14}-\frac{10}{14}=\frac{1}{14}\)
\(b;\frac{5}{8}:\frac{8}{12}=\frac{5}{8}:\frac{2}{3}=\frac{5}{8}\times\frac{3}{2}=\frac{15}{16}\)
\(c;\frac{2}{5}+\frac{1}{6}\times\frac{2}{7}=\frac{2}{5}+\frac{2}{42}=\frac{2}{5}+\frac{1}{21}=\frac{42}{105}+\frac{5}{105}=\frac{47}{105}\)
tích mình nhen
=20/14:5/14=20/14*14/5=20/5=4