⒈ mn(m‐n)-m(n-m) ⒉m²﹙x-y﹚+n²﹙y-x﹚ ⒊﹙a²-2ab+b²﹚-4 ⒋ ﹙x²+y²﹚²-4x²y² ⒌ 9 ﹙a+2b﹚²-4﹙a-b﹚² ⒍﹙x+y﹚²-4
﹙x+y﹚+4 ⒎ a的4次方-2a²b²+b 的4次方 ⒏5﹙x-y﹚³+10﹙y-x ﹚ ²
⒈ mn(m‐n)-m(n-m) ⒉m²﹙x-y﹚+n²﹙y-x﹚ ⒊﹙a²-2ab+b²﹚-4 ⒋ ﹙x²+y²﹚²-4x²y² ⒌ 9 ﹙a+2b﹚²-4﹙a-b﹚² ⒍﹙x+y﹚²-4
﹙x+y﹚+4 ⒎ a的4次方-2a²b²+b 的4次方 ⒏5﹙x-y﹚³+10﹙y-x ﹚ ²
1.解原式=mn(m-n)+m(m-n)
=m(m-n)(n+1)
2.解原式=m²(x-y)-n²(x-y)
=(m²-n²)(x-y)
=(m+n)(m-n)(x-y)
3.解原式=(a+b)²-2²
=(a+b+2)(a+b-2)
4.解原式=﹙x²+y²﹚²-(2xy)²
=(x+y+2xy)(x+y-2xy)
5.解原式={3(a+2b)}²-{2(a-b)}²
={3(a+2b)+2(a-b)}{3(a+2b)-2(a-b)}
=(5a+4b)(a+7b)
6.解原式=(x+y)²-2²
=(x+y+2)(x+y-2)
7.解原式=(a²)²-2a²b²+(b²)²
=(a²-b²)²
={(a+b)(a-b)}²
=(a+b)²(a-b)²
8.解原式=5﹙x-y﹚³+10﹙x-y﹚ ²
=5﹙x-y﹚²(x-y+2)