-4(a-b)²+16(a+b)²
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 04:06:14
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-4(a-b)²+16(a+b)²
-4(a-b)²+16(a+b)²
-4(a-b)²+16(a+b)²
-4(a-b)²+16(a+b)²
=4[4(a+b)²-(a-b)²
=4[2(a+b)+(a-b)][2(a+b)-(a-b)]
=4(2a+2b+a-b)(2a+2b-a+b)
=4(3a+b)(a+3b)