3 mũ x +3-18.3 mũ x =3 mũ 7
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TT
0
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
7 tháng 8
Bài 1:
2\(x\) = 4
2\(^x\) = 22
\(x=2\)
Vậy \(x=2\)
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
7 tháng 8
Bài 2:
2\(^x\) = 8
2\(^x\) = 23
\(x=3\)
Vậy \(x=3\)
TT
0
14 tháng 10 2018
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BN
5
NM
3 tháng 8 2023
2x = 64
⇒ 2x = 26
⇒ x = 6.
7x = 710 : 75
⇒ 7x = 75
⇒ x = 5.
3x = 315 : 243
⇒ 3x = 315 : 35
⇒ 3x = 310
⇒ x = 10.
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
3 tháng 8 2023
\(2^x=64=2^6\Rightarrow x=6\\ ---\\ 7^x=7^{10}:7^5=7^5\Rightarrow x=5\\ ----\\ 3^x=3^{15}:243=3^{15}:3^5=3^{10}\Rightarrow x=10\)
\(3^{x+3}-18.3^x=3^7\)
\(3^x.\left(3^3-18\right)=3^7\)
\(3^x.\left(27-18\right)=3^7\)
\(3^x.9=3^7\)
\(3^x.3^2=3^7\)
\(3^{x+2}=3^7\)
\(x+2=7\)
\(x=7-2\)
\(x=5\)