2^2x-3 - 2.5^2 = 5^2
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Tĩm x : 5^2x-3 - 2.5^2=5^2: bạn ơi
5^2x-3 - 2.5^2 = 5^2
2x - 3 là số mủ của 5 đó bạn ạ
Các bạn giải hộ mình bài này tí mính đang cần gấp. mình cảm ơn
5^2x-3-2.5^2=5^2.3
\(5^{2x-3}-2\cdot5^2=5^2\cdot3\)
\(\Rightarrow5^{2x-3}-50=75\)
\(\Rightarrow5^{2x-3}=75+50\)
\(\Rightarrow5^{2x-3}=125\)
\(\Rightarrow5^{2x-3}=5^3\)
\(\Rightarrow2x-3=3\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
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5^2x-3-2.5^2=5^2.3
\(5^{2x-3}-2.5^2=5^2.3\)
\(5^{2x-3}=2.5^2+5^2.3\)
\(2x-3=3\)
\(2x=3+3\)
\(2x=6\)
\(x=6:2=3\)
\(\Rightarrow x=3\)
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a,3^2x=81
b,52x-3-2.52=52
Bài lớp mấy vậy ?
Ai trả lời nhanh mik k cho
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a,210-5(x-11)=200
b,(2x+1):7=2^2+3^2
c,450:[41-(2x-5]=3^2.5
d,(5x-9).7+3=80
\(a,210-5\left(x-11\right)=200\\ \Rightarrow5\left(x-11\right)=10\\ \Rightarrow x-11=2\\ \Rightarrow x=13.\\ b,\left(2x+1\right):7=2^2+3^2\\ \Rightarrow\left(2x+1\right):7=4+9\\ \Rightarrow\left(2x+1\right):7=13\\ \Rightarrow2x+1=91\\ \Rightarrow2x=90\\ \Rightarrow x=45.\\ c,450:\left[41-\left(2x-5\right)\right]=3^2.5\\ \Rightarrow450:\left[41-\left(2x-5\right)\right]=45\\ \Rightarrow41-\left(2x-5\right)=10\\ \Rightarrow2x-5=31\\ \Rightarrow2x=36\\ \Rightarrow x=18.\\ d,\left(5x-9\right).7+3=80\\ \Rightarrow\left(5x-9\right).7=77\\ \Rightarrow5x-9=11\\ \Rightarrow5x=20\\ \Rightarrow x=4.\)
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a) \(210-5\left(x-11\right)=200\)
\(5.\left(x-11\right)=210-200\)
\(5.\left(x-11\right)=10\)
\(x-11=10:5\)
\(x-11=2\)
\(x=2+11\)
\(x=13\)
b) \(\left(2x+1\right):7=2^2+3^2\)
\(\left(2x+1\right):7=13\)
\(2x+1=13.7\)
\(2x=91-1\)
\(2x=90\)
\(x=90:2\)
\(x=45\)
c) \(450:\left[41-\left(2x-5\right)\right]=3^2.5\)
\(450:\left[41-\left(2x-5\right)\right]=45\)
\(\left[41-\left(2x-5\right)\right]=450:45\)
\(\left[41-\left(2x-5\right)\right]=10\)
\(2x-5=41-10\)
\(2x-5=31\)
\(2x=31+5\)
\(2x=36\)
\(x=36:2\)
\(x=18\)
d) \(\left(5x-9\right).7+3=80\)
\(\left(5x-9\right).7=80-3\)
\(5x-9=77:7\)
\(5x-9=11\)
\(5x=11+9\)
\(5x=20\)
\(x=20:5\)
\(x=4\)
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52x-3-2.52=52.3
\(5^{2x-3}-2=5^2.3:5^2\)
\(5^{2x-3}-2=3\)
\(5^{2x-3}=3+2\)
\(5^{2x-3}=5^1\)
=> 2x-3=1
2x=1+3
2x=4
x=4:2
x=2
Vậy x=2
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\(5^{2x-3}-2.5^2=5^2.3\)
\(5^{2x-3}-2.25=25.3\)
\(5^{2x-3}-2.25=75\)
\(5^{2x-3}-2=75:25\)
\(5^{2x-3}-2=3\)
\(5^{2x-3}=3-2\)
\(5^{2x-3}=1\)
\(5^{2x-3}=5^0\)
\(\Rightarrow2x-3=0\)
\(2x=0+3\)
\(x=3:2\)
\(x=1.5\)
Vậy x = 1.5
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52x-3-2.52=52.3
\(\Leftrightarrow5^{2x-3}=5^2.3+2.5^2\Leftrightarrow5^{2x-3}=5^2.\left(3+2\right)=5^2.5=5^3\Rightarrow2x-3=3\Leftrightarrow2x=3+3=6\)
=>x=3
k mink nhé, thksss
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52x-3-2.52 = 52.3
\(5^{2x-3}-2.5^2=5^2.3\)
\(5^{2x-3}=5^2.3+2.5^2\)
\(5^{2x-3}=5^2\left(2+3\right)\)
\(5^{2x-3}=5^3\Rightarrow2x-3=3\Rightarrow2x=6\Rightarrow x=3\)
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52x - 3 - 2 . 52 = 52 . 3
52x - 3 - 2 . 25 = 25 . 3
52x - 3 - 2 . 25 = 75
52x - 3 - 50 = 75
52x - 3 = 75 + 50
52x - 3 = 125
\(\Rightarrow\) 52x - 3 = 53
\(\Rightarrow\) 2x - 3 = 3
2x = 3 + 3
2x = 6
x = 6 : 2
x = 3.
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52x-3-2.52=52.3
52x-3 =52.3+2.52
52x-3 =52(3+2)
52x-3 =52.51
52x-3 =53
2x-3 =3
2x =3+3
2x = 6
x = 6 : 2
x = 3
Vậy x = 3 .
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52x-3-2.52=52.3
\(5^{2x-3}-2\cdot5^2=5^2\cdot3\)
\(\left(5^2\right)^x:125-50=75\)
\(25^x:125=125\)
\(25^x=15625\)
\(25^x=25^3\)
\(\Rightarrow x=3\)
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