10+2x=45:9.3
Những câu hỏi liên quan
Tim x€n
a.72.2-6.(2x+5)=10^5:10^3
b.(5x+3^4).6^8=6^9.3^4
Tim x€n
a.72.2-6.(2x+5)=10^5:10^3
b.(5x+3^4).6^8=6^9.3^4
Đúng 0
Bình luận (0)
\(\frac{2^9.3^{10}+2^8.3^7.135}{2^{10}.3^{10}+2^9.3^{11}}\)
Ta có :
\(\frac{2^9.3^{10}+2^8.3^7.135}{2^{10}.3^{10}+2^9.3^{11}}\)\(=\frac{2^9.3^{10}+2^8.3^7.3^3.5}{2^{10}.3^{10}+2^9.3^{11}}=\frac{2^9.3^{10}+2^8.3^{10}.5}{2^{10}.3^{10}+2^9.3^{11}}=\frac{2^8.3^{10}.\left(2+5\right)}{2^8.3^{10}.\left(2^2+2.3\right)}=\frac{7}{10}\)
Ủng hộ mk nha !!!! ***
Đúng 0
Bình luận (0)
\(=\frac{2^9.3^{10}+2^8.3^7.3^3.5}{2^{10}.3^{10}+2^9.3^{11}}=\frac{2^8.3^{10}.\left(2+5\right)}{2^8.3^{10}.\left(2^2+2.3\right)}=\frac{7}{10}\)
Đúng 0
Bình luận (0)
15116544
tích mình nhé các bạn thân yêu
Đúng 0
Bình luận (0)
Xem thêm câu trả lời
Tính:
2
x
+
x
2
x
2
-
9
.
3
-
x
2
x
2
-
8
. A.
-
x
...
Đọc tiếp
Tính: 2 x + x 2 x 2 - 9 . 3 - x 2 x 2 - 8 .
A. - x 2 ( x + 3 ) ( x - 2 )
B. x 2 ( x + 3 ) ( x - 2 )
C. - x 2 ( x - 3 ) ( x - 2 )
D. x 2 ( x + 3 ) ( x + 2 )
1. 3x+9.3-x=10
\(3^x+9\cdot3^{-x}=10\)
=>\(3^x+\dfrac{9}{3^x}=10\)
=>\(\dfrac{\left(3^x\right)^2+9}{3^x}=10\)
=>\(\left(3^x\right)^2+9=10\cdot3^x\)
=>\(\left(3^x\right)^2-10\cdot3^x+9=0\)
=>\(\left(3^x-1\right)\left(3^x-9\right)=0\)
=>\(\left[{}\begin{matrix}3^x-1=0\\3^x-9=0\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}3^x=1\\3^x=9\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=0\\x=2\end{matrix}\right.\)
Đúng 1
Bình luận (0)
2^10.3^10-2^10.3^9/2^9.3^10
2^10.3^10-2^10.3^9/2^9.3^10
=2^10.3^9(3-1)/2^9.3^10
=2^11.3^9/2^9.3^10
=4/3
Đúng 0
Bình luận (0)
Tim x€n
a.71.2-6.(2x+5)=10^5:10^3
b.(5x+3^4).6^8=6^9.3^4
Cac ban giup minh nha
Minh can ngay bay gio
Rút gọn
2^10.3^10-2^10.3^9/2^9.3^10
Bài làm
\(\frac{2^{10}.3^{10}-2^{10}.3^9}{2^9.3^{10}}\)
\(=\frac{2^{10}\left(3^{10}-3^9\right)}{2^9.3^{10}}\)
\(=\frac{2\left[3^9\left(3-1\right)\right]}{3^{10}}\)
\(=\frac{2\left[3^9.2\right]}{3^{10}}\)
\(=\frac{4.3^9}{3^{10}}\)
\(=\frac{4}{3}\)
Vậy giá tị biểu thức là \(\frac{4}{3}\)
rut gon phan so 2^10.3^10-2^10.3^9 /2^9.3^10
Phân số trên = 2^10.3^9.(3-1)/2^9.3^10
= 2^10.3^9.2/2^9.3^10
= 2^11.3^9/2^9.3^10
= 2^2/3 = 4/3
Tk mk nha
Đúng 1
Bình luận (0)