问题
解答题
化简下列各式: (1)[(0.064
(2)
|
答案
(1)原式={[(
)64 1000
]-1 5
} 5 2
-(2 3
)27 8
-1(2分)1 3
=[(
)3]4 10
×(-1 5
)×5 2
-[(2 3
)3]3 2
-1(4分)1 3
=
-5 2
-1(6分)3 2
=0(7分)
(2)原式=
=2lg2+lg3 1+
lg0.62+1 2
lg241 4
(4分)2lg2+lg3 1+lg
+lg22×3 10
=
=2lg2+lg3 1+lg2+lg3-lg10+lg2
=(17分)2lg2+lg3 2lg2+lg3