运用平方差公式计算:(1)(6x+1)(6x-1) (2)(-x=2/3y)(x+2/3y) (3)(-根号5 a+5b)(-根号5 a-5b)(4)(4m-1/3n)(-4m-1/3n)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 21:26:20

运用平方差公式计算:(1)(6x+1)(6x-1) (2)(-x=2/3y)(x+2/3y) (3)(-根号5 a+5b)(-根号5 a-5b)(4)(4m-1/3n)(-4m-1/3n)
运用平方差公式计算:(1)(6x+1)(6x-1) (2)(-x=2/3y)(x+2/3y) (3)(-根号5 a+5b)(-根号5 a-5b)
(4)(4m-1/3n)(-4m-1/3n)

运用平方差公式计算:(1)(6x+1)(6x-1) (2)(-x=2/3y)(x+2/3y) (3)(-根号5 a+5b)(-根号5 a-5b)(4)(4m-1/3n)(-4m-1/3n)
(1)(6x+1)(6x-1)
=(6x)²-1
=36x²-1
(2)(-x+2/3y)(x+2/3y)
=(2/3y-x)(2/3y+x)
=(2/3y)²-x²
=4/9y²-x²
(3)(-根号5 a+5b)(-根号5 a-5b)
=(-√5a)²-(5b)²
=5a²-25b²
(4)(4m-1/3n)(-4m-1/3n)
=(-1/3n+4m)(-1/3n-4m)
=(-1/3n)²-(4m)²
=1/9n²-16m²

(1)(6x+1)(6x-1)
=36x²-1

(2)(-x+2/3y)(x+2/3y)
=(2/3y-x)(2/3y+x)
=(4/9)y²-x²

(3)(-根号5 a+5b)(-根号5 a-5b)
=5-25b²

(4)(4m-1/3n)(-4m-1/3n)
=(-1/3n+4m)(-1/3n-4m)
=(1/9)n²-16m²