2/3+2/1+2/27+2/81+...+2/2187=——
2/3+2/1+2/27+2/81+...+2/2187=——
2/3+2/9+2/27+2/81+……+2/2187=_______
已知3^1=3,3^2=9,3^3=27,3^4=81,3^5=243,3^6=729,3^7=2187,… 推测3^2
1-2/3-2/9-2/27-2/81-2/243-2/729=?求简算
已知3^1=3,3^2=9,3^3=27,3^4=81,3^5=243,3^6=729,3^7=2187,3^8=656
3^1=3,3^2=9,3^3=27,3^4=81,3^5=243,3^6=729,3^7=2187,3^8=6561.
解方程:(1)+(x—2)平方=81 (2)(x—1)立方=—27 (3)—3(x+1)平方=192
观察下列算式:3^1=3,3^2=9,3^3=27,3^4=81,3^5=243,3^6=729,3^7=2187,3^
观察下面的式子:3^1=3,3^2=9,3^3=27,3^4=81,3^5=243,3^6=729,3^7=2187,3
观察下列算式:3^1=3,3^2=9,3^3=27,3^4=81,3^5=243,3^6=729,3^7=2187,3^
3^1 3^2 3^3 3^4 3^5 3^6 3^7 3^8 3 9 27 81 243 729 2187 6561
观察下列等式:3^1=3,3^2=9,3^3=27,3^4=81,3^5=243,3^6=729,3^7=2187,……