题目内容
(1)求(2
)
-(-9.6)0-(3
)-
+0.1-2的值;
(2)log4(3x-1)=log4(x-1)+log4(3+x),求x.
1 |
4 |
1 |
2 |
3 |
8 |
2 |
3 |
(2)log4(3x-1)=log4(x-1)+log4(3+x),求x.
(1)(2
)
-(-9.6)0-(3
)-
+0.1-2
=(
)
-1-(
)-
+(
)-2
=
-1-
+100
=
;
(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.
1 |
4 |
1 |
2 |
3 |
8 |
2 |
3 |
=(
9 |
4 |
1 |
2 |
27 |
8 |
2 |
3 |
1 |
10 |
=
3 |
2 |
4 |
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.
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