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1) 62 . x = 36
=> x = 36 / 36 = 1
2) 9x - 42 = 11
9x - 16 = 11
9x = 11 + 16 =27
=> x = 27/9=3
3) 10 + 2x = 42
2x = 16 - 10 =6
=> x = 3
4) 231 - ( x - 6 ) =103
( x - 6 ) = 231-103=128
=> x = 128+6=134
5) 10 + 3x = 45 / 42
3x = 43-10=64-10=54
x = 18
6)25 + 52x = 82 + 62
25 + 25x = 100
25x = 100-25=75
=> x = 75/25=3
*Chúc bạn học tốt*
1) 62.x=36 2) 9.x-42=11 3)10+2.x=42 4)231-(x-6)=103 5)10+3x=45:42 6)25+52.x=82+62
36.x=36 9.x-16=11 10+2.x=16 x-6 = 231-103 10+3x=43 25+25.x =64+36
x=36:36 9.x =11+16 2.x =16-10 x-6 =128 10+3x=64 25+25.x =100
x=1 9.x =27 2.x =6 x =128+6 3x=64-10 25.x =100-25
x =27:9 x =6:2 x =134 3x=54 25.x =75
x =3 x =3 x=54:3 x =75:25
x=18 x =3
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Ta có: \(2^{2x}:2^2=10\cdot2^4+6\cdot2^4\)
\(\Leftrightarrow2^{2x}=2^8\cdot2^2=2^{10}\)
Suy ra: 2x=10
hay x=5
ta có: 22.x:22=10.24+6.24
22.x:22=160+96=256=162
22.x=162.22=1024
x=1024:22
x=256=162
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\(\left(4+2^2+2^3+2^4+...+2^{10}\right)x=2^{22}-2^{21}\)
\(\Rightarrow\left(2^2+2^2+2^3+...+2^{10}\right)x=2^{21}\left(2-1\right)\)
\(\Rightarrow2^{20}.x=2^{21}\) (Vì \(2^2+2^2=2^3\))
\(\Rightarrow x=2\)
Vậy x=2
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\(\left\{10^2-\left[3^2.5+2^3.\left(4+2^{12}:2^{11}\right)\right]\right\}.2\)
\(=\left\{100-\left[3^2.5+2^3.\left(4+2\right)\right]\right\}.2\)
\(=\left\{100-\left[9.5+8.6\right]\right\}.2\)
\(=\left\{100-93\right\}.2\)
\(=7.2=14\)
\(\left\{10^2-\left[3^2\times5+2^3\times\left(4+2^{12}:2^{11}\right)\right]\right\}\times2\)
\(=\left\{100-\left[9\times5+8\times\left(4+2\right)\right]\right\}\times2\)
\(=\left\{100-\left[9\times5+8\times6\right]\right\}\times2\)
\(=\left\{100-93\right\}\times2\)
\(=7\times2\)
\(=14\)
\(\left(10-2x\right)^2=4\)
\(TH1:10-2x=2\)
\(2x=8\)
\(x=4\)
\(TH2:10-2x=-2\)
\(2x=12\)
\(x=6\)