3x9=?
2x7 = 3x9
\(2x^7=3x^9\\ \Rightarrow\dfrac{x^7}{x^9}=\dfrac{3}{2}\\ \Leftrightarrow\dfrac{1}{x^2}=\dfrac{3}{2}\\ \Leftrightarrow3x^2=2\\ \Rightarrow x^2=\dfrac{2}{3}\\ \Rightarrow x=\pm\sqrt{\dfrac{2}{3}}\)
`2x^7 =3x^9`
`2x^7 -3x^9 =0`
`x^7 (2-3x^2)=0`
`=>x^7=0` hoặc `2-3x^2 =0`
`=>x=0` hoặc `3x^2 =2`
`=>x=0` hoặc \(x=\sqrt{\dfrac{2}{3}}\) hoặc \(x=-\sqrt{\dfrac{2}{3}}\)
3x9=?
Số cần tìm là :
3 x 9 = 27
Đáp số : 27
(27-3x9)x1370=?
(27 - 3 × 9) × 1370
= (27 - 27) × 1370
= 0 × 1370
= 0
(1/3)^2x1/3x9^2
\(\left(\dfrac{1}{3}\right)^2\cdot\dfrac{1}{3\cdot9^2}=\dfrac{1}{9\cdot3\cdot9^2}=\dfrac{1}{3^7}\)
3x9+10-20x9 = ?
1x3:3x9:3x12;3=?
1x3:3x9:3x12;3=12
tick nhé Phan Thê Tinh
3x9
3x8
3 x 9 = 27
3 x 8 = 24
Ai k mik , mik k lại !!!!!!!!!!!!! ^_^
*8*3x9=70**7*
mk nghĩ đề là :
*8*3 x 9 = 70**7*
=> 7853 x 9 = 70677
10^9x81^10/8^4x25^3x9^10
\(\dfrac{10^9\cdot81^{10}}{8^4\cdot25^3\cdot9^{10}}=\dfrac{2^9\cdot5^9\cdot3^{40}}{2^{12}\cdot5^6\cdot3^{20}}=\dfrac{5^3\cdot3^{20}}{2^3}\)