tìm x
x/5 = 26/65 3/x = 51/85
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\(\dfrac{x}{5}=\dfrac{26}{65}\)
\(\dfrac{x}{5}=\dfrac{2}{5}\)
\(x=2\)
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\(\dfrac{3}{x}=\dfrac{51}{85}\)
\(\dfrac{3}{x}=\dfrac{3}{5}\)
`x=5`
\(a,\dfrac{x}{4}=\dfrac{15}{20}\\ \Rightarrow\dfrac{x}{4}=\dfrac{3}{4}\\ \Rightarrow x=3\\ b,\dfrac{15}{x}=\dfrac{25}{35}\\ \Rightarrow\dfrac{15}{x}=\dfrac{5}{7}\\ \Rightarrow\dfrac{15}{x}=\dfrac{15}{21}\\ \Rightarrow x=21\\ c,\dfrac{x}{5}=\dfrac{26}{65}\\ \Rightarrow\dfrac{x}{5}=\dfrac{2}{5}\\ \Rightarrow x=2\\ d,\dfrac{3}{x}=\dfrac{51}{85}\\ \Rightarrow\dfrac{3}{x}=\dfrac{3}{5}\\ \Rightarrow x=5\)
a,x4=1520⇒x4=34⇒x=3b,15x=2535⇒15x=57⇒15x=1521⇒x=21c,x5=2665⇒x5=25⇒x=2d,3x=5185⇒3x=35⇒x=5
\(\dfrac{51}{85}=\dfrac{39}{65}\)
\(\dfrac{15}{21}=\dfrac{25}{35}\)
\(\frac{26}{39}=\frac{2}{3}\)
\(\frac{55}{77}=\frac{5}{7}\)
\(\frac{39}{65}=\frac{3}{5}\)
\(\frac{51}{85}=\frac{3}{5}\)
\(\frac{38}{57}=\frac{2}{3}\)
Các phân số bằng nhau là:
\(\frac{39}{65}=\frac{51}{85}\left(=\frac{3}{5}\right)\)
\(\frac{26}{39}=\frac{38}{57}\left(=\frac{2}{3}\right)\)
26/39 = 2/3
55/77 = 5/7
39/65 = 3/5
25/35 = 5/7
51/85 = 3/5
38/57 = 2/3
=> 26/39 = 38/57
55/77 = 35/35
39/65 = 51/85
hok tốt
26/39 = 2/3
55/77 = 5/7
39/65 = 3/5
25/35 = 5/7
51/85 = 3/5
38/57 = 2/3
=> 26/39 = 38/57
55/77 = 35/35
39/65 = 51/85
a)
\(\dfrac{1}{2}=0,5;\dfrac{3}{4}=0,75;\dfrac{7}{5}=1,4;\dfrac{9}{8}=1,125;\dfrac{26}{25}=1,04;\dfrac{120}{125}=0,96\)
b)
\(\dfrac{15}{25}=0,6;\dfrac{75}{25}=3;\dfrac{90}{300}=0,3;\dfrac{27}{36}=0,75;\dfrac{51}{85}=0,6\)
a,1/2=5/10;3/4=75/100;7/5=140/100;26/25=108/100;120/125=960/1000
b,15/25=60/100;75/25=300/100;90/300=3/10;27/36=3/4=75/100;
51/85=3/5=60/100;39/65=3/5=60/100
\(\dfrac{x}{5}=\dfrac{26}{65}\)
\(\Leftrightarrow65x=130\)
\(\Leftrightarrow x=2\)
\(\dfrac{3}{x}=\dfrac{51}{85}\)
\(\Leftrightarrow51x=255\)
\(\Leftrightarrow x=5\)
`x/5=26/65`
`65xx x=5xx26`
`65xx x=130`
`x=130:65=2`
`3/x=51/85`
`51xx x=3xx85`
`51xx x=255`
`x=255:51=5`