分析:(1)利用有理數(shù)指數(shù)冪的運(yùn)算性質(zhì),把
2(×)6+()-4()--×80.25+(-2005)0等價(jià)轉(zhuǎn)化為
2(2×3)6+(2×2)-4×-2×2+1,由此能夠求出結(jié)果.
(2)在
lg5•lg8000+(lg2)2 |
lg600-lg0.36 |
中,利用對(duì)數(shù)的性質(zhì)和運(yùn)算法則,分子=lg5(3+3lg2)+3(lg2)
2,分母=(lg6+2)-lg
.由此能夠求出結(jié)果.
解答:解:(1)
2(×)6+()-4()--×80.25+(-2005)0=
2(2×3)6+(2×2)-4×-2×2+1=2×2
2×3
3+2-7-2+1
=210.
(2)在
lg5•lg8000+(lg2)2 |
lg600-lg0.36 |
中,
分子=lg5(3+3lg2)+3(lg2)
2
=3lg5+3lg2(lg5+lg2)=3;
分母=
(lg6+2)-lg=lg6+2-lg=3.
∴
lg5•lg8000+(lg2)2 |
lg600-lg0.36 |
=
=1.
點(diǎn)評(píng):第(1)題考查有理數(shù)指數(shù)冪的運(yùn)算性質(zhì)和運(yùn)算法則,第(2)題考查對(duì)數(shù)的運(yùn)算性質(zhì)和運(yùn)算法則,是基礎(chǔ)題.解題時(shí)要認(rèn)真審題,仔細(xì)解答,注意合理地進(jìn)行等價(jià)轉(zhuǎn)化.