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2/3 = 2 x 4/ 3 x 4 =8/12
8/14 = 8 : 2/ 14 : 2 =4/7
5/9 = 5 x3/ 9 x 3 =15/37
35/ 40 = 35 : 5/ 40 : 5=7/8
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\(\frac{2}{5}=\frac{4}{10}=\frac{16}{40}=\frac{14}{35}\)
\(\frac{60}{84}=\frac{10}{14}=\frac{5}{7}=\frac{25}{35}\)
chúc bn hok tốt
\(\frac{2}{5}=\frac{14}{35}=\frac{14}{x}\Rightarrow x=35\)
\(\frac{60}{84}=\frac{5}{7}=\frac{10}{14}=\frac{x}{14}\Rightarrow x=10\)
\(\frac{60}{84}=\frac{5}{7}=\frac{5}{x}\Rightarrow x=7\)
\(\frac{60}{84}=\frac{5}{7}=\frac{25}{35}=\frac{x}{35}\Rightarrow x=25\)
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\(\frac{2}{5}=\frac{4}{10}=\frac{16}{40}=\frac{14}{35}\)
\(****nha\)
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bài 1:
các ps ....lớn đến bé là:
b1:8/10;14/20;27/40;5/8.
b2: (rút gọn)
5/8 ; 4/5 ; 7/10 ; 27/40.
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a, =(5+40)+(8+37)+(11+34)+(14+31)+(17+28)+(20+23)
= 45 + 45 + 45 + 45 + 45 + 43
= 90 + 90 + 83
= 180 + 83
= 263
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a: \(\dfrac{11}{42}=\dfrac{11\cdot1}{42\cdot1}=\dfrac{11}{42}\)
\(\dfrac{5}{6}=\dfrac{5\cdot7}{6\cdot7}=\dfrac{35}{42}\)
b: \(\dfrac{40}{7}=\dfrac{40\cdot4}{7\cdot4}=\dfrac{160}{28}\)
\(\dfrac{10}{28}=\dfrac{10\cdot1}{28\cdot1}=\dfrac{10}{28}\)
c: \(\dfrac{4}{15}=\dfrac{4\cdot4}{15\cdot4}=\dfrac{16}{60}\)
\(\dfrac{14}{60}=\dfrac{14\cdot1}{60\cdot1}=\dfrac{14}{60}\)
a)\(\dfrac{11}{42}=\dfrac{35}{42}\)
b) \(\dfrac{160}{28}=\dfrac{10}{28}\)
c) \(\dfrac{16}{60}=\dfrac{14}{60}\)
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\(a:=\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{1}{5}+\dfrac{2}{5}\right)\\ =1+\dfrac{3}{5}=1\dfrac{3}{5}\\ b:=\left(\dfrac{2}{7}+\dfrac{1}{7}\right)+\left(\dfrac{5}{14}+\dfrac{3}{14}\right)\\ =\dfrac{3}{7}+\dfrac{8}{14}\\ =\dfrac{3}{7}+\dfrac{4}{7}=1\)
2/5 = 4/10 = 16/40 = 14/35