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45 - 3 x (x+2) = 8 x 3 = 24
3 x (x+2) = 45 - 24 = 21
x+2 = 21 : 3 = 7
x = 7-2 = 5
k mk nha
3 x (x+2) = 45 - 24 = 21
x+2 = 21 : 3 = 7
x = 7-2 = 5
chúc bn hok tốt @_@
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3*2^x-3=45
3*2^x=45+3=48
2^x=48:3=16
2^x=2^4
=> x=4
Vậy x=4
3.2x-3=45
\(\Rightarrow\)3.2x=45+3
\(\Rightarrow\)3.2x=48
\(\Rightarrow\)2x=48:3
\(\Rightarrow\)2x=16
\(\Rightarrow\)2x=24
\(\Rightarrow\)x=4
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-45 : 5 (-3-2x)=3
<=> -9(-3-2x)=3
<=>-3-2x=-1/3
<=> 2x = -8/3
<=> x = -4/3
Vậy ...
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\(a,12\left(x-1\right)=0\\ x-1=0\\ x=1\\ b,45+5\left(x-3\right)=70\\ 5\left(x-3\right)=25\\ x-3=5\\ x=8\\ c,3.x-18:2=12\\ 3.x-9=12\\ 3.x=21\\ x=7\)
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45- / x+2 / = 27
/ x+2 / = 45-27
/ x+2 / = 18
Suy ra x+2 = 18 hoặc x+2 = -18
Suy ra x =16 x = -20
Vậy x =16 hoặc x = -20
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(3^3)^2 + 2^x = 733
729 + 2^x = 733
2^x = 733 - 729
2^x = 4
Vậy x = 2
k cho mình nha
\(3.2^x-3=45\)
\(3.2^x=45+3\)
\(3.2^x=48\)
\(2^x=48:3\)
\(2^x=16\)
\(2^x=2^4\)
\(\Rightarrow x=4\)
3 . 2x - 3 = 45
<=> 3 . 2x = 48
<=> 2x = 16
<=> 2x= 24
<=> x = 4(t/m)