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\(\frac{6}{8}=\frac{15}{x}\)
\(\Rightarrow6x=15\cdot8\)
\(\Rightarrow6x=120\)
\(\Rightarrow x=20\)
Vậy x = 20
\(\frac{6}{8}=\frac{15}{x}\)
\(\Rightarrow\frac{60}{80}=\frac{60}{4x}\)
\(\Rightarrow80=4x\)
\(\Rightarrow x=20\)
Vậy x=20
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có \(\frac{6}{8}=\frac{15}{x}\Rightarrow\frac{3}{4}=\frac{15}{x}\) => 3.x = 4.15 = 60 => x = 20
Dấu chấm là dấu nhân
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Ta có \(\frac{6}{8}=\frac{15}{x}\)
\(\Rightarrow\frac{3}{4}=\frac{15}{x}\)
\(\Rightarrow3x=4.15=60\)
\(\Rightarrow x=20\)
Ta có :
\(\frac{6}{8}=\frac{15}{x}\)
\(\Leftrightarrow\frac{3}{4}=\frac{15}{x}\)
\(3x=60\)
\(x=20\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\((28\times15-34\times12)\times a:6+8=24\)
\(\Rightarrow12\times a:6=24-8\)
\(\Rightarrow2\times a=16\)
\(\Rightarrow a=16:2=8\)
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a, 3/4 ÷ x/6 = 0,75
x/6 = 0,75 ÷ 0,75
x/6 = 1
=> x = 6
Vậy x = 6
b, 2,5 . 45/ x = 5/6
45/x = 5/6 ÷ 2,5
45/x = 1/3
=> x = 45 × 3
=> x = 135
Vậy x = 135
c, x/12 + 121,5 = 121,5
x/12 = 121,5 - 121,5
x/12 = 0
=> x = 0
Vậy x = 0
e, 6/8 = 15/x
3/4 = 15/x
=> x = 20
Vậy x = 20
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x + 1/15 = 1/3 - 1/4 = 4/12 - 3/12 = 1/12.
=> x = 1/12 - 1/15 = 5/60 - 4/60 = 1/60.
b) x - 5/12 = 1/3 + 1/4 = 4/12 + 3/12 = 7/12.
=> x = 7/12 + 5/12 = 1
c) x x 2/7 = 3/4 x 4/15 = 1/5
=> x = 1/5 : 2/7 = 1/5 x 7/2 = 7/10
d) x : 3/8 = 4/3 : 3/6 = 4/3 x 2 = 8/3
=> x = 8/3 x 3/8 = 1
\(x:\dfrac{6}{8}=\dfrac{15}{x}\)
\(\Leftrightarrow x^2=\dfrac{45}{4}\)
hay \(x\in\left\{\dfrac{3\sqrt{5}}{2};-\dfrac{3\sqrt{5}}{2}\right\}\)
Lớp 5 chắc là chưa học đến 2 nghiệm