问题 解答题
计算或化简:(1)23-(
1
2
0-(
1
2
-2
(2)(3x-1)(2x+3)-(x+3)(x-3).
答案

(1)23-(

1
2
0-(
1
2
-2

=8-1-4,

=3;

(2)(3x-1)(2x+3)-(x+3)(x-3),

=6x2+7x-3-(x2-9),

=6x2+7x-3-x2+9,

=5x2+7x+6.

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