因式分解:(1)36-25b的2次方 (2)16a的2次方-9b的2次方 (3)9(a+b)的2次方-4(a-b)的2次方

2025-01-02 13:10:00
推荐回答(5个)
回答1:

(1)36-25b的2次方
=(6+5b)(6-5b)

(2)16a的2次方-9b的2次方
=(4a+3b)(4a-3b)

(3)9(a+b)的2次方-4(a-b)的2次方
=[3(a+b)+2(a-b)][3(a+b)-2(a-b)]
=(5a+b)(a+5b)

(4)-4m的3次方+16m的2次方-6m
=-2m(2m^2-8m+3)

(5)5m(a+b)-a-b
=5m(a+b)-(a+b)
=(a+b)(5m-1)

(6)3m(x-y)-2(y-x)的2次方
=3m(x-y)-2(x-y)^2
=(x-y)(3m-2x+2y)

回答2:

1)36-25b的2次方
=(6+5b)(6-5b)

2)16a的2次方-9b的2次方
=(4a+3b)(4a-3b)

3)9(a+b)的2次方-4(a-b)的2次方
={3(a+b)+2(a-b)}{3(a+b)-2(a-b)}
=(5a+b)(a+5b)

4)-4m的3次方+16m的2次方-6m
=-2m(2m^2-8m+3)
或:
-4m的3次方+16m的2次方-16m
=-4m(m^2-4m+4)
=-4m(m-2)^2

5)5m(a+b)-a-b
= 5m(a+b)-(a+b)
=(a+b)(5m-1)

6)3m(x-y)-2(y-x)的2次方
=3m(x-y)-2(x-y)的2次方
=(x-y)(3m-2(x-y))
=(x-y)(3m-2x+2y)

回答3:

1)
=(6+5b)(6-5b)

2)
=(4a+3b)(4a-3b)

3)
={3(a+b)+2(a-b)}{3(a+b)-2(a-b)}
=(5a+b)(a+5b)

4)
=-2m(2m^2-8m+3)
或:

=-4m(m^2-4m+4)
=-4m(m-2)^2

5)
= 5m(a+b)-(a+b)
=(a+b)(5m-1)

6)
=(x-y)(3m-2(x-y))
=(x-y)(3m-2x+2y)

回答4:

36-25b^2
=(6+5b)(6-5b)

16a^2-9b^2
=(4a+3b)(4a-3b)

(a+b)^2-4(a-b)^2
=[(a+b)-2(a-b)][(a+b)+2(a-b)]
=(a+b-2a+2b)(a+b+2a-2b)
=(3b-a)(3a-b)

-4m^3+16m^2-16m
=-4m(m^2-4m+4)
=-4m(m-2)^2

5m(a+b)-a-b
=5m(a+b)-(a+b)
=(5m-1)(a+b)

3m(x-y)-2(y-x)^2
=3m(x-y)-2(x-y)^2
=(x-y)[3m-2(x-y)]
=(x-y)(3m-2x+2y)

回答5:

36-25b²=(6-5b)(6+5b)
16a²-9b²=(4a-3b)(4a+3b)
9(a+b)²-4(a-b)²=(3a+3b-2a+2b)(3a+3b+2a-2b)=(a+5b)(5a+b)
-4m³+16m²-6m=-m (4m²-16m+6)=-m(4m²-16m+16-10)
=-m((2m-4)²-10)
=-m(2m-4-√10)(2m-4+√10)
5m(a+b)-a-b =(5m-1)(a+b)
3m(x-y)-2(y-x)²=(3m-2x+2y)(x-y)