因式分解 好高分~~~~

A) 6a+24b = 6(a+4b)

(B) 12u-20uv = 4u(3-5v)

C) d(d-5)+7(5-d) = d(d-5)-7(d-5)
= (d-5)(d-7)


(D) ab+ac+bd+cd =(ab+bd) + (ac+cd)
=b(a+d)+c(a+d)
=(a+d)(b+c)

A. 6a + 24b
= 6 (a + 4b)

B. 12u - 20uv
= 4u (3 - 5v)

C. d (d - 5) + 7 (5 - d)
= d (d - 5) - 7 (d - 5)
= (d - 5) (d - 7)

D. ab + ac + bd + cd
= a (b + c) + d (b + c)
= (b + c) (a + d)

a) 6a+24b
=6(a+4b)

b)12u-20uv
=4u(3-5v)

c) d(d-5)+7(5-d)
=d(d-5)-7(d-5)
= (d-5)(d-7)

d) ab+ac+bd+cd
=a(b+c) +d(b+c)
=(a+d)(b+c)

希望幫到你^^

(A)6(a+4b)
(B)4u(3-5v)
(C)d^2-5d+35-7d=d^2-12d+35=(d-5)(d-7)
(D)a(b+c)+d(b+c)=(a+d)(b+c)