问题
解答题
计算: (1)
(2)
(3)
(4)
(5)-
(6)
|
答案
(1)原式=
=4;4 2 2
(2)原式=
=16 10
=8 5 2 5
;10
(3)原式=
=
•7 6a
•6a 6a
;42a 6a
(4)原式=
=3a 8a
=3 8
=3 2 2
;6 4
(5)原式=-
=-
×9 2 3 8
;3 3 4
(6)原式=b a
=a2
|a|.b a