分析:(1)根據(jù)單項(xiàng)式乘單項(xiàng)式的運(yùn)算法則,及單項(xiàng)式除以單項(xiàng)式的運(yùn)算法則,結(jié)合有理數(shù)指數(shù)冪的運(yùn)算性質(zhì),我們先對(duì)分子進(jìn)行化簡(jiǎn),進(jìn)而得到結(jié)果.
(2)根據(jù)對(duì)數(shù)的運(yùn)算性質(zhì)、絕對(duì)值的性質(zhì)、完成平方公式,我們可以分別去掉(2)中的絕對(duì)值符號(hào)、根據(jù)及對(duì)數(shù)運(yùn)算符,進(jìn)而得到答案.
解答:解:(1)
=
=
-a(2)
|1+lg0.001|++lg6-lg0.02=
|1-3|++lg(2×3)-lg(2×0.01)=
|-2|+|lg+2|+lg2+lg3-(lg2+lg0.01)=2+2-lg3+lg2+lg3-lg2+2
=6
點(diǎn)評(píng):本題考查的知識(shí)點(diǎn)是有理數(shù)指數(shù)冪的運(yùn)算性質(zhì),對(duì)數(shù)的運(yùn)算性質(zhì),熟練掌握這些運(yùn)算性質(zhì)是解答指數(shù)混合運(yùn)算和對(duì)數(shù)混合運(yùn)算的關(guān)鍵.