题目内容
已知a=(2
)
-(9.6)0-(3
)-
+(1.5)-2,b=(log43+log83)(log32+log92),求a+2b的值.
1 |
4 |
1 |
2 |
3 |
8 |
2 |
3 |
a=(2
)
-(9.6)0-(3
)-
+(1.5)-2
=(
)2×
-1-(
)3×(-
)+(
)-2
=
-1=
.
b=(log43+log83)(log32+log92)
=(
log23+
log23)(log32+
log32)
=
×
=
,
∴a=
,b=
,
∴a+2b=3.
1 |
4 |
1 |
2 |
3 |
8 |
2 |
3 |
=(
3 |
2 |
1 |
2 |
3 |
2 |
2 |
3 |
3 |
2 |
=
3 |
2 |
1 |
2 |
b=(log43+log83)(log32+log92)
=(
1 |
2 |
1 |
3 |
1 |
2 |
=
5 |
6 |
3 |
2 |
=
5 |
4 |
∴a=
1 |
2 |
5 |
4 |
∴a+2b=3.
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