m2-12m+20
=(m-10)(m-2)
10-3a-a2
=-(a²+3a-10)
=-(a+5)(a-2)
x2-10xy+9y2
=(x-y)(x-9y)
(x-1)(x+4)-36
=x²+3x-4-36
=x²+3x-40
=(x+8)(x-5)
ma2-18ma-40m
=m(a²-18a-40)
=m(a-20)(a+2)
x3-5x2y-24xy2
=x(x²-5xy-24y²)
=x(x-8)(x+3)
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解:m ²-12m+20 =(m-10)(m-2)
10-3a-a ²=(2-a)(5+a) =﹣(a-2) (a+5)
x²-10xy+9y²= (x-9y)(x-y)
(x-1)(x+4)-36=x²+3x-40=(x+8)(x-5)
ma²-18ma-40m=m(a-20)(a+2)
x ³-5x2y-24xy²=x(x-8y)(x+3y)
(m-10)(m-2) (2-a)(5+a) (x-9y)(x-y) x2+3x-40=(x+8)(x-5)
m(a-20)(a+2) x(x-8y)(x+3y)