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Hiệu x – y | 432 | 308 | 602 | 2000 | 2345 |
Tỉ số x : y | 4:1 | 2:1 | 6:3 | 5:3 | 7:2 |
x | 576 | 616 | 1206 | 5000 | 3283 |
y | 144 | 308 | 603 | 3000 | 938 |
`1716:y=12xx13`
`1716:y=156`
`y=1716:156`
`y=11`
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`y xx 2/3+y xx 1/6=10/3`
`y xx(2/3+1/6)=10/3`
`y xx(4/6+1/6)=10/3`
`y xx5/6=10/3`
`y=10/3:5/6`
`y=10/3xx6/5=4`
1716 : y = 12 \(\times\) 13
1716 : y = 156
y = 1716 : 156
y = 11
\(y\times\dfrac{2}{3}+y\times\dfrac{1}{6}=\dfrac{10}{3}\)
\(y\times\left(\dfrac{2}{3}+\dfrac{1}{6}\right)=\dfrac{10}{3}\)
\(y\times\dfrac{5}{6}=\dfrac{10}{3}\)
\(y=\dfrac{10}{3}:\dfrac{5}{6}\)
\(y=4\)
\(y.\left(1+2+3\right)=36\)
\(y.6=36\)
\(y=36:6\)
\(y=6\)
Chú ý: dấu . là nhân
y x 1 + y x 2 + y x 3 = 36
y x ( 1 + 2 +3 ) = 36
y x 6 = 36
y = 36 : 6
y = 6
\(x+\frac{3}{5}=\frac{4}{5}\)
\(\Rightarrow x=\frac{4}{5}-\frac{3}{5}\)
\(\Rightarrow x=\frac{1}{5}\)
\(y-\frac{1}{3}=\frac{1}{2}\)
\(\Rightarrow y=\frac{1}{2}+\frac{1}{3}\)
\(\Rightarrow y=\frac{5}{6}\)
Kết luận : \(x\times y=\frac{1}{5}\times\frac{5}{6}=\frac{5}{30}=\frac{1}{6}\)
* x + 3/5 = 4/5
x = 4/5 - 3/5
x = 1/5
* y - 1/3 = 1/2
y = 1/2 + 1/3
y = 5/6
Vậy x nhân y = 1/5 x 5/6 =1/6
3/5 x y + 1/2 : 5/3 - 5/4 = 1/2 x 1/3
3/5xy +3/10 -5/4 =1/6
3/5xy=1/6 -3/10+5/4=67/60
y= 67/60:3/5=67/36
\(\Leftrightarrow y\times\left(\dfrac{1}{7}+\dfrac{9}{21}+\dfrac{7}{3}\right)=\dfrac{5}{3}\)
\(\Leftrightarrow y\times\dfrac{61}{21}=\dfrac{5}{3}\)
\(\Leftrightarrow y=\dfrac{5}{3}:\dfrac{61}{21}=\dfrac{35}{61}\)
y x (1/7 +9/21 +7/3)= 5/3
y x 61/21 = 5/3
y = 5/3 : 61/21
y= 35/61
y x 1/2 + y x 3/2 =100
y x (1/2 +3/2) =100
y x 4/2 = 100
y = 100: 4/2 =200