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PH NG TRNH , H PH NG TRNH M V LGARIT D ng 1. Ph ng trnh c b n a) Ph ng trnh m c b n c d ng: x a m = , trong 0, 1 a a v m l s cho. N u m , th ph ng trnh x a m = v nghi m. N u m , th ph ng trnh x a m = c nghi m duy nh t log a x m = . b) Ph ng trnh lgarit c b n c d ng: log a x m = , trong m l s cho. Ph ng trnh c i u ki n xc nh l x > 0 ( 0, 1 a a ). V i m i m , ph ng trnh log a x m = c nghi m duy nh t m x a = . VD1. Gi i cc ph ng trnh sau: 1. 1 1 5 6.5 3.5 52 x x x +- +- = 2. 1 2 3 1 2 3 3 3 9.5 5 5 x x x x x x + + + + + + + = + + 3. 1 3 .2 72 x x + = 4.- + + + + + + = + 2 2 2 3 2 6 5 2 3 7 4 4 4 1 x x x x x x 5.-- +- +- + 2 1 1 1 5.3 7.3 1 6.3 9 x x x x VD2. Gi i cc ph ng trnh sau: 1. ( 29 3 log 2 1 x x + = 2. ( 29 ( 29 2 2 2 log 3 log 6 10 1 x x--- + = 3. ( 29 ( 29 log 15 log 2 5 2 x x + +- = 4. ( 29 1 2 log 2 5 x x +- = B i t p Gi i cc ph ng trnh sau: 1. 1 2 3 2.3 25 x x +-- = 2. 1 2 2 3.2 2.5 5 2 x x x x +-- + = + 3.... View Full Document

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