问题
解答题
化简:(1)
(2)
|
答案
(1)原式=
,
+2 3
(2
+5
)+7
(3
+5
) 7
=
,
+2 3 (
+2
)(3
+5
)7
=
,1
+5 7
=
=
-7 5 7-5
(1 2
-7
);5
(2)原式=
,
(1+26
+2
) 3
(6
+3
)+ 2
(3
+3
) 2
=
,
(1+6
+2
+2
)3
(3
+3
)(2
+1)2
=
•(2
+1
+3 2
),1
+12
=
•(2
-3
+2
-1),2
=
-6
.2