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Giải:
a) câu này mình bó tay, chắc sai đề. không có số nào mũ 3 = 243.
b) 32 x 3x = 81
=> 32+x=81
=> 32+x=34
=> 2 + x = 4 => x = 2
c) (2x + 1)4=16
=> (2x + 1)4=24
=> 2x + 1 = 2
=> không có x nào để thỏa mãn (2x + 1)4=16.
d) x20=x => x = {0;1}
a, x^3 = 243
=> x^3 = 7^3
=> x = 7
b, 3^2 . 3^x = 81
=> 3^2x = 3^4
=> 2x =4
=> x = 4
c, (2x + 1)^4 = 16
=> (2x + 1) ^4 = 2^4 = (-2)^4
TH1 : 2x + 1 = 2
=> 2x = 1
=> x = 1/2
TH2 : 2x + 1 = -2
=> 2x = -3
=> x = -3/2
d, x^20 = x
=> x = 0 hoặc 1
a) x8 : x2 = 16
x6 = 16 = ... ( chỗ này bn xem có số nào mũ 6 = 16 ko nha)
...
b) x3.x2.x-4 = 60
x3+2-4 = 60
x-1 = 60 = (1/60)-1
=> x = 1/60
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1. 15^x=225
<=>15^x=15^2
=>x=2
vậy....
2. x^3=27
<=>x^3=3^3
=>x=3
vậy......
3. 4.2^x-3=125
4.2^x=128
2^x=32
2^x=2^5
=>x=5
vậy.....
\(15^x=225\)
\(\Leftrightarrow15^x=15^2\)
\(\Leftrightarrow x=2\)
\(x^3=27\)
\(\Leftrightarrow x^3=3^3\)
\(\Leftrightarrow x=3\)
\(4.2^x-3=125\)
\(\Leftrightarrow4.2^x=125+3\)
\(\Leftrightarrow4.2^x=128\)
\(\Leftrightarrow2^x=128:4\)
\(\Leftrightarrow2^x=32\)
\(\Leftrightarrow2^x=2^5\)
\(\Leftrightarrow x=5\)
~ Hok tốt ~
a ) 2x = 32
=> 25
b ) 3x = 243
=> 35
c ) 2x = 256
=> 28
120,130,140,150 nhiều lắm
mk trả lời nhầm câu nha