问题
解答题
化简求值 (1)
(2) lg14-2lg
|
答案
(1)原式=(
)25 4
+(1 2
)27 8
+(0.0625)1 3
+1-1 4
=5(6分)1 2
(2)原式=lg(2×7)-2(lg7-lg3)+lg7-lg(32×2)
=lg2+lg7-2lg7+2lg3+lg7-2lg3-lg2=0(6分)
化简求值 (1)
(2) lg14-2lg
|
(1)原式=(
)25 4
+(1 2
)27 8
+(0.0625)1 3
+1-1 4
=5(6分)1 2
(2)原式=lg(2×7)-2(lg7-lg3)+lg7-lg(32×2)
=lg2+lg7-2lg7+2lg3+lg7-2lg3-lg2=0(6分)