4+6+8...120
2*2+4*4+6*6+8*8+...+118*118+120*120
đáp án = 295240
chúc bạn học tốt nhé
4^6 . 4^5 + 6^9 . 120 / 8^4 . 3^12 - 6^11
4^6*9^3+6^9*120/8^4*3^12*6^11
\(\dfrac{4^6\cdot9^3+6^9\cdot120}{8^4\cdot3^{12}\cdot6^{11}}=\dfrac{2^{12}\cdot3^6+2^9\cdot2^3\cdot3^9\cdot3\cdot5}{2^{12}\cdot3^{23}\cdot2^{11}}\)
\(=\dfrac{2^{12}\cdot3^6+2^{12}\cdot3^{10}\cdot5}{2^{23}\cdot3^{23}}\)
\(=\dfrac{2^{12}\cdot3^6\left(1+3^4\cdot5\right)}{2^{23}\cdot3^{23}}=\dfrac{1}{2^{11}}\cdot\dfrac{1}{3^{17}}\cdot406\)
\(=\dfrac{203}{2^{10}\cdot3^{17}}\)
4^6*9^5+6^9*120/8^4*3^12-6^11
`Answer:`
`(4^6 . 9^5 + 6^9 . 120)/(8^4 . 3^12 - 6^11)`
`= (2^12 . 3^10 + 2^9 . 3^9 . 2^3 . 3 . 5)/(2^12 . 3^12 - 2^11 . 3^11)`
`= (2^12 . 3^10 + 2^12 . 3^10 . 5)/(2^11 . 3^11(2 . 3 - 1))`
`= (2^12 . 3^10 (1 + 5))/(2^11 . 3^11 . 5)`
`= (2 . 6)/(3 . 5)`
`= 4/5`
4^6 . 9^5 + 6^9 .120 / 8^4 . 3^12 - 6^11
\(\frac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}\) đề là như thế này à hay là sao ???
tính
4^6 . 4^5 + 6^9 . 120 / 8^4 . 3^12 - 6^11
4^6 . 9^5 +6^9 . 120 / 8^4 . 3^12 - 6^11
4^6\9^6+6^9\120
8^4\3^12-6^11
10×4^6×9^5+6^9×120
8^4×3^12-6^11
\(\frac{10.4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}=\frac{2.5.\left(2.2\right)^6.\left(3.3\right)^5+\left(2.3\right)^9.3.40}{\left(2.2.2\right)^4.3^{12}-\left(2.3\right)^{11}}=\frac{2.5.2^6.2^6.3^5.3^5+2^9.3^9.3.40}{2^4.2^4.2^4.3^{12}-2^{11}.3^{11}}\)
\(=\frac{2^{13}.5.3^{10}+2^{12}.5.3^{10}}{2^{12}.3^{12}-2^{11}.3^{11}}=\frac{2^{12}.5.3^{10}.\left(2+1\right)}{2^{11}.3^{11}\left(2.3-1\right)}=\frac{2^{12}.5.3^{11}}{2^{11}.5.3^{11}}=2\)