问题
解答题
计算 (1)
(2)(2+
(3)(
(4)
(5)
|
答案
(1)原式=
=2
×sqrt63 2 6
;3
(2)原式=22-3=1;
(3)原式=(
)2+(5
)2-2×2 5
×5 2 5
=5+
-44 5
=
;9 5
(4)原式=(145-24)(145+24)
=121×169
=11×13
=143;
(5)原式=64×81
=
×64 81
=8×9
=72.