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