10
=4b³(8a³-b^6)
=4b³(2a-b²)(4a²-2ab²+b^4)
11.
=(2abc-1)(4a²b²c²+2abc+1)
12.
=y³(64x^6+y^12)
=y³(4x²+y^4)(16x^4-4x²y^4+y^8)
13.
=[x(a+b)-y（a-b)]²
=(xa+xb-ya+yb)²
14.
=aⁿ﹣²(a^4-8a²+16)
=aⁿ﹣²(a-2)²(a+2)²(a+4)²
15.
=(3a+xⁿ)²+2(3a+xⁿ)+1
=(3a+xⁿ+1)²
16
=(a+b-c)²
17.
=(x-3y+2z)²
18.
=(p+q-p+q)³
=8q³
19.
=-(a-b)²(a+b)²
20.
=[（a+x)²+（a-x)²[(a+x)²-（a-x)²]
=(a²+2ax+x²+a²-2ax+x²)(a+x-a+x)(a+x+a-x)
=4ax(2a²+2x²)
=8ax(a²+x²)
=
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