问题
解答题
(1)计算:
(2)解方程组:
|
答案
(1)原式=2
(53
+3
-43
)3
=2
×23 3
=12;
(2)①+②得3x=9
∴x=3
把x=3代入①得y=-1
∴原方程组的解是
.x=3 y=-1
(1)计算:
(2)解方程组:
|
(1)原式=2
(53
+3
-43
)3
=2
×23 3
=12;
(2)①+②得3x=9
∴x=3
把x=3代入①得y=-1
∴原方程组的解是
.x=3 y=-1