问题
解答题
(1)解方程:x2-2x-3=0; (2)计算:(2
|
答案
(1)x2-2x-3=0
(x-3)(x+1)=0
x=3或-1;
(2)原式=(2×2
-3×3
)×3 3 6
=(4
-3
)×3 6
=3
×3 6
=9
.2
(1)解方程:x2-2x-3=0; (2)计算:(2
|
(1)x2-2x-3=0
(x-3)(x+1)=0
x=3或-1;
(2)原式=(2×2
-3×3
)×3 3 6
=(4
-3
)×3 6
=3
×3 6
=9
.2