问题
解答题
(1)求(2
(2)log4(3x-1)=log4(x-1)+log4(3+x),求x. |
答案
(1)(2
)1 4
-(-9.6)0-(31 2
)-3 8
+0.1-22 3
=(
)9 4
-1-(1 2
)-27 8
+(2 3
)-21 10
=
-1-3 2
+1004 9
=
;1801 18
(2)∵log4(3x-1)=log4(x-1)+log4(3+x),
∴3x-1=(x-1)(3+x),∴x2-x-2=0,
解得x=2或x=-1,经检验x=-1不符合题意;
故原方程解为x=2.