问题
解答题
(1)解方程组:
(2)计算:(
|
答案
(1)
,3x+2y=-1① 3(y+2)=3-2x②
由①得,x=
③,将③代入②得,3y+6=3+-2y-1 3
,4y+2 3
解得:y=-
,则可得x=7 5
,3 5
即可得方程组的解为
.x= 3 5 y=- 7 5
(2)原式=
-218
-45
+29 2 2 45
=3
-2 9 2 2
=-
.3 2 2
(1)解方程组:
(2)计算:(
|
(1)
,3x+2y=-1① 3(y+2)=3-2x②
由①得,x=
③,将③代入②得,3y+6=3+-2y-1 3
,4y+2 3
解得:y=-
,则可得x=7 5
,3 5
即可得方程组的解为
.x= 3 5 y=- 7 5
(2)原式=
-218
-45
+29 2 2 45
=3
-2 9 2 2
=-
.3 2 2