F.2數學補習問題,識既入尼教下我T^T

axy+4ay
= ay(x+4)
18ac+6ab
= 6a(3c+b)
abc二次方+ab二次方c
= abc(c+b)
-4a-ab
= -a(4+b)
-6xy二次方-12xy
= -6xy(y+2)
6a-9b-3c
= 3(2a-3b-c)
20a+5b-15c
= 5(4a+b-3c)
2x(3-y)-(3-y)
= (3-y)(2x-1)
x(x+y)-y(x+y)
= (x+y)(x-y)
x(2x+3y)-3(2x+3y)
= (2x+3y)(x-3)
x(1+y)-9(1+y)
= (1+y)(x-9)
x(y-6)-410(y-6)
= (y-6)(x-410)
z(x+2y)+(x+2y)
= (x+2y)(z+1)
x(z+7y)-5(z+7y)
= (z+7y)(x-5)
4x(5x-y)+3(5x-y)
= (5x-y)(4x+3)
64-9k^2
= (8-3k)(8+3k)
20-45r^2
= 5(4-9r^2)
= 5(2-3r)(2+3r)
x^2+2x+1
= (x+1)^2
a^2-8a+16
= (a-4)^2
16k^2-24k+9
= (4k-3)^2
9h^2-30hk+25k^2
= (3h-5k)^2
20w^2+20w+5
= 5(4w^2 + 4w + 1)
= 5(2w+1)^2
18h^2-24h+8
= 2(9h^2 - 12h + 4)
= 2(3h-2)^2
2a^2+4ab+2b^2
= 2(a^2 + 2ab + b^2)
= 2(a+b)^2

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