6x(a²-b²)-18y(a-b)
=6x(a+b)(a-b)-18y(a-b)
=6(a-b)[x(a+b)-3y]
=6(a-b)(ax+bx-3y)
16n²(n-3)²+72n(n-3)+81
=[4n(n-3)+9]²
=(4n²-12n+9)²
=[(2n-3)²]²
=(2n-3)的4次方
6x(a²-b²)-18y(a-b)
=6x(a+b)(a-b)-18y(a-b)
=6(a-b)[x(a+b)-3y]
=6(a-b)(ax+bx-3y)
16n²(n-3)²+72n(n-3)+81
=[4n(n-3)+9]²
=(4n²-12n+9)²
=[(2n-3)²]²
=(2n-3)的4次方