题目内容
计算或化简:
(1)23﹣(
)0﹣(
)﹣2;
(2)(3x﹣1)(2x+3)﹣(x+3)(x﹣3).
(1)23﹣(
(2)(3x﹣1)(2x+3)﹣(x+3)(x﹣3).
解:(1)23﹣(
)0﹣(
)﹣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.
=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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