计算:4(x+2y)²-9(x-y)²
来源:学生作业学帮网 编辑:学帮网 时间:2024/06/28 21:29:48
计算:4(x+2y)²-9(x-y)²
4(x+2y)²-9(x-y)²
=[2(x+2y)]²-[3(x-y)]²
=(2x+4y-3x+3y)(2x+4y+3x-3y)
=(7y-x)(5x+y)
4(x+2y)²-9(x-y)²
=[2(x+2y)+3(x-y)][2(x+2y)-3(x-y)]
=(5x+y)(7y-x)
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来源:学生作业学帮网 编辑:学帮网 时间:2024/06/28 21:29:48
计算:4(x+2y)²-9(x-y)²
4(x+2y)²-9(x-y)²
=[2(x+2y)]²-[3(x-y)]²
=(2x+4y-3x+3y)(2x+4y+3x-3y)
=(7y-x)(5x+y)
4(x+2y)²-9(x-y)²
=[2(x+2y)+3(x-y)][2(x+2y)-3(x-y)]
=(5x+y)(7y-x)