(12-x-y)² 化简
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 02:12:54
![(12-x-y)² 化简](/uploads/image/z/6852375-63-5.jpg?t=%2812-x-y%29%26%23178%3B+%E5%8C%96%E7%AE%80)
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(12-x-y)² 化简
(12-x-y)² 化简
(12-x-y)² 化简
原式=[12-(x+y)]²
=144-24(x+y)+(x+y)²
=144-24x-24y+x²+2xy+y²
144-24x-24y+x^2+2xy+y^2
原式=[12-(x+y)]^2
=12^2-2*12(x+y)+(x+y)^2
=……后面你知道了吧...