题目
化简求值:
(1)
(7+4 ) ﹣81 +32 ﹣2×( ) + ×(4 )﹣1
(2)
(log62)2+(log63)2+3log62×(log6 ﹣ log62).
答案: 解:原式=[(2+ 3 )2] 12 ﹣ (34)18 + (25)×35 ﹣2× (2−3)−23 + 213 × (22)13 =2+ 3 ﹣ 3 +8﹣8+2=4
解:原式= (log62)2+(log63)2+3log62×log618323 , = (log62)2+(log63)2+3log62×log693 ,=(log62)2+(log63)2+2log62×log63= (log62+log63)2=1