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A = (30: 7\(\dfrac{1}{2}\)) : (\(\dfrac{1}{15}\):0,5) -1,5\(\times\)(4\(\dfrac{1}{2}\)-\(\dfrac{9}{2}\))
A = (30 : \(\dfrac{15}{2}\)): (\(\dfrac{1}{15}\) \(\times\) 2) - 1,5 \(\times\) (\(\dfrac{9}{2}\) - \(\dfrac{9}{2}\))
A = (30 \(\times\) \(\dfrac{2}{15}\)) : \(\dfrac{2}{15}\) - 1,5 \(\times\) 0
A = 4 \(\times\) \(\dfrac{15}{2}\) - 0
A = 30
( x - 15 ) : 5 + 20 = 22
( x - 15 ) : 5 = 22 - 20
( x - 15 ) : 5 = 2
( x - 15 ) = 2 . 5
x - 15 = 10
x = 10 + 15
=> x = 25
\(\frac{x}{20}=\frac{12}{15}\)
Ta có : \(x.15=20.12\)
\(\Rightarrow x.15=240\)
\(x=240:15=16\)
\(\frac{x}{4}=\frac{9}{x}\)
Ta có : \(x.x=4.9\)
\(\Rightarrow x.x=36\)
\(\Rightarrow x=6\)
1. \(\frac{x}{20}=\frac{12}{15}\)\(=>15x=12.20=>15x=240=>x=16\)
2.\(\frac{x}{4}=\frac{9}{x}\)\(=>x^2=9.4=>x^2=36\)\(=>x=\orbr{\begin{cases}6\\-6\end{cases}}\)
Do 3/x=y/8=15/20(=3/4)
<=> 3/x=3/4 <=> 3x=12 <=> x=4 và y/8=3/4 <=> 4y=24 <=> y=6
Vậy x=4;y=6
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3,2.x-0,6=2.25:1,5
3,2.x-0,6=1,5
3,2.x=1,5-0,6
3,2.x=0,9
x=2,88
\(x\times2+15=1,5\times\left(x+20\right)\)
\(x\times2+15=1,5\times x+30\)
\(\Rightarrow x\times2-1,5\times x=30-15\)
\(x\times\left(2-1,5\right)=15\)
\(x\times0,5=15\)
\(x=15:0,5\)
\(x=30\)
\(x\times2+15=1,5\times\left(x+20\right)\)
\(\Rightarrow x\times2+15=1,5\times x+\left(1,5\times20\right)\)
\(\Rightarrow x\times2+15=1,5\times x+30\)
\(\Rightarrow1,5\times x-x\times2=15-30\)
\(\Rightarrow\left(1,5-2\right)\times x=-15\)
\(\Rightarrow-0,5\times x=-15\)
\(\Rightarrow x=-15:-0,5\)
\(\Rightarrow x=30\)
Vậy x = 30
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