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16.已知一等比級數公比為3,末項為486,又級數和為728
Mar 16th 2014, 09:12
12.已知一等比數列第8項為20,第15項為-5/32,則其公比為(A)1/2(B)-1/2(C)3/2(D)-3/2 13.已知一等比數列第3項為10,第6項為-5/4,則其第10項為(A)5/64(B)-5/64(C)-5/128(D)5/128 15.一等比級數首項為25,公比為-2,和為-8525,則此級數共有(A)9(B)10(C)11(D)12項 16.已知一等比級數公比為3,末項為486,又級數和為728,則其項數n=(A)4(B)5(C)6(D)7 17.等比數列根號2-1,1,根號2+1,3+2根號2,...的第n項為(A)根號2(2-根號2)^2(B)(根號2+1)^n-1(C)(根號2+1)^n-2(D)(根號2-1)(2+根號2)^n-1 18.等比級數1+3+3^2+...+3^n的和為3280,則n=(A)6(B)7(C)8(D)9 20.無窮等比級數0.36+0.036+0.0036+0.00036+...的和為(A)2/5(B)3/5(C)4/15(D)7/15 21.已知一無窮等比級數第2項為-2,第5項為16/27,則此級數和為(A)7/3(B)8/3(C)8/5(D)9/5 急需~~~~~~~
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