225 x 3/5 =
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52 . x - 3 = 225
=> 25 . x = 225 + 3
=> 25 . x = 228
=> x = 9,12
Vậy x = 9,12
52 . x - 3 = 225
=> 25 . x = 225 + 3
=> 25 . x = 228
=> x = 9,12
Vậy x = 9,12
52 . x - 3 = 225
=> 25 . x = 225 + 3
=> 25 . x = 228
=> x = 9,12
Vậy x = 9,12
52 . x - 3 = 225
=> 25 . x = 225 + 3
=> 25 . x = 228
=> x = 9,12
Vậy x = 9,12
52 . x - 3 = 225
=> 25 . x = 225 + 3
=> 25 . x = 228
=> x = 9,12
Vậy x = 9,12
52 . x - 3 = 225
=> 25 . x = 225 + 3
=> 25 . x = 228
=> x = 9,12
Vậy x = 9,12
230-5.(x-32)=225
225.(x-32)=225
x-32=225:225
x-32=1
x-9=1
x=9+1
x=10
\(a,96-3\left(x+8\right)=42\\ \Rightarrow3\left(x+8\right)=54\\ \Rightarrow x+8=18\\ \Rightarrow x=10.\\ b,15.5\left(x-25\right)-225=0\\ \Rightarrow75\left(x-25\right)-225=0\\ \Rightarrow75\left(x-25\right)=225\\ \Rightarrow x-25=3\\ \Rightarrow x=28.\\ c,250:x+15=25\\ \Rightarrow250:x=10\\ \Rightarrow x=25\\ d,36:\left(x-5\right)=2^2\\ \Rightarrow36:\left(x-5\right)=4\\ \Rightarrow x-5=9\\ \Rightarrow x=14.\\ e,\left[3.\left(70-x\right)+5\right]:2=46\\ \Rightarrow3.\left(70-x\right)+5=92\\ \Rightarrow3\left(70-x\right)=87\\ \Rightarrow70-x=29\\ \Rightarrow x=41.\)
\(\Rightarrow\dfrac{\left(2x-1+1\right)\left[\left(2x-1-1\right):2+1\right]}{2}=225\\ \Rightarrow2x\left[\left(2x-2\right):2+1\right]=450\\ \Rightarrow2x\left(x-1+1\right)=450\\ \Rightarrow2x^2=450\Rightarrow x^2=225\Rightarrow x=15\)
\(\dfrac{x}{3}=\dfrac{y}{4}\Leftrightarrow\dfrac{x^2}{9}=\dfrac{y^2}{16}\)
\(\dfrac{z}{5}=\dfrac{z^2}{25}\)
Áp dụng tính chất dãy tỉ số bằng nhau:
\(\dfrac{x^2+y^2}{9+16}=\dfrac{x^2+y^2}{25}=\dfrac{225}{25}=9\)
\(\Rightarrow x=\sqrt{9\cdot9}=9\)
\(\Rightarrow y=\sqrt{9\cdot16}=12\)
\(\Rightarrow z=\sqrt{9\cdot25}=15\)
\(\dfrac{x}{3}=\dfrac{y}{4}=\dfrac{z}{5}\)
\(\Rightarrow\dfrac{x^2}{9}=\dfrac{y^2}{16}=\dfrac{x^2+y^2}{9+16}=\dfrac{225}{25}=9\)
\(\Rightarrow\left\{{}\begin{matrix}x^2=9.9=81\\y^2=16.9=144\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=9\\y=12\end{matrix}\right.\)
\(\Rightarrow z=\dfrac{9}{3}.5=15\)
Vậy \(\left\{{}\begin{matrix}x=9\\y=12\\z=15\end{matrix}\right.\) thỏa đề bài
225 x 3/5 = 225 x 3/5 = 675/5 = 135