8 x 8 = 8²

9 x 9 x 9 x 9 x 9 x 9 x 9 = 9⁷

\(8x8=8^2=64\)

\(9x9x9x9x9x9x9=9^7=4782969\)

\(8.8=8 ^2=64\)

\(9.9.9.9.9.9.9=9^7=4782969\)

\(=999999999\)

= 999999999

kết quả bằng =9999999909

tự tính

999999999

12 345 679 x 9 x 9

=111 111 111 x 9

=999 999 999

k for morre

#hungB

\(P=\dfrac{8^4.3^5-4^6.9^3}{4^6.9^3+4^8.3^5}\)

\(=\dfrac{\left(2^3\right)^4.3^5-\left(2^2\right)^6.\left(3^2\right)^3}{\left(2^2\right)^6.\left(3^2\right)^3+\left(2^2\right)^8.3^5}\)

\(=\dfrac{2^{12}.3^5-2^{12}.3^6}{2^{12}.3^6+2^{16}.3^5}\)

\(=\dfrac{2^{12}\left(3^5-3^6\right)}{2^{12}.2^4\left(3^3+3^5\right)}\)

\(=\dfrac{\left(-3\right)}{8.3^8}\)

\(=\dfrac{-1}{8.3^7}\)

\(P=\dfrac{8^4.3^5-4^6.9^3}{4^6.9^3+4^8.3^5}=\dfrac{2^{12}.3^5-2^{12}.3^6}{2^{12}.3^6+2^{16}.3^5}=\dfrac{2^{12}.3^5\left(1-3\right)}{2^{12}.3^5\left(3+2^4\right)}=\dfrac{-2}{19}\)Nguyễn Thanh Hằng xem lại kết quả đi

\(9x9=81\)

Thử lại :

\(81:9=9\)

mik chắc ăn 100% với kết quả của mik !!!!!!

9 x 9 = 81 

ai tích cho mk mk tích lại

tích mk nha Trần Thị Ngọc Ánh

Bằng 81

9nhân9=81

9x9=81

9.9

=9^2

=81

kik nhá

\(A=\dfrac{2^{13}.9^5}{6^8.8^3}=\dfrac{2^{13}.3^{10}}{3^8.2^8.2^9}=\dfrac{2^{13}.3^{10}}{3^8.2^{17}}=\dfrac{3^2}{2^4}=\dfrac{9}{16}\)

\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+...+\frac{1}{8.9.10}=\frac{1}{2}.\left(\frac{1}{1.2}-\frac{1}{2.3}\right)+\frac{1}{2}.\left(\frac{1}{2.3}-\frac{1}{3.4}\right)+...+\frac{1}{2}.\left(\frac{1}{8.9}-\frac{1}{9.10}\right)\)

\(=\frac{1}{2}.\left(\frac{1}{1.2}-\frac{1}{2.3}+\frac{1}{2.3}-\frac{1}{3.4}+...+\frac{1}{8.9}-\frac{1}{9.10}\right)\)

\(\frac{1}{2}.\left(\frac{1}{1.2}-\frac{1}{9.10}\right)=\frac{1}{2}.\frac{22}{45}=\frac{11}{45}\)

\(\frac{8^4.3^5-4^6.9^3}{4^6.9^3+4^8.3^5}=\frac{8^4}{4^8}=\frac{4096}{65536}=\frac{1}{16}\)

k nha 

\(\frac{8^4.3^5-4^6.9^3}{4^6.9^3+4^8.3^5}=\frac{2^{12}.3^5-2^{12}.3^6}{2^{12}.3^6+2^{16}.3^5}=\frac{2^{12}.3^5\left(1-3\right)}{2^{12}.3^5\left(3-2\right)}=\frac{-2}{1}\) = -2

Xin một câu quote nha! ^^