分解因式①25x²-y²;②(a-b)(x-y)+(a-b)(x+y);③(x+2y)²-8xy
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/25 01:49:46
分解因式①25x²-y²;②(a-b)(x-y)+(a-b)(x+y);③(x+2y)²-8xy分解因式①25x²-y²;②(a-b)(x-y)+(a
分解因式①25x²-y²;②(a-b)(x-y)+(a-b)(x+y);③(x+2y)²-8xy
分解因式①25x²-y²;②(a-b)(x-y)+(a-b)(x+y);③(x+2y)²-8xy
分解因式①25x²-y²;②(a-b)(x-y)+(a-b)(x+y);③(x+2y)²-8xy
①25x²-y²
=(5x+y)(5x-y)
②(a-b)(x-y)+(a-b)(x+y)
=(a-b)[(x-y)+(x+y)]
=2x(a-b)
③(x+2y)²-8xy
=x²+4xy+4y²-8xy
=x²-4xy+4y²
=(x-2y)²
①平方差 (5x+y)(5x-y)
②提公因式(a-b)2x
③开括号再整理x^2+4xy+4y^2-8xy=x^2-4xy+4y^2=(x-2y)^2
可追问 望采纳