因式分解:1.a²-2a2.(a+2)(a-2)+3a 3.a²-4 4.2a²-18
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因式分解:1.a²-2a2.(a+2)(a-2)+3a3.a²-44.2a²-18因式分解:1.a²-2a2.(a+2)(a-2)+3a3.a²-44
因式分解:1.a²-2a2.(a+2)(a-2)+3a 3.a²-4 4.2a²-18
因式分解:1.a²-2a2.(a+2)(a-2)+3a 3.a²-4 4.2a²-18
因式分解:1.a²-2a2.(a+2)(a-2)+3a 3.a²-4 4.2a²-18
a²-2a
=a(a-2)
(a+2)(a-2)+3a
=a^2-4+3a
=(a-1)(a+4)
a²-4
=(a+2)(a-2)
2a²-18
=2(a^2-9)
=2(a+3)(a-3)
a²-2a =a(a-2) 2.(a+2)(a-2)+3a =a²-4+3a =(a+4)(a-1) 3.a²-4 =(a+2)(a-2) 4.2a²-18 =2(a²-9)
=2(a+3)(a-3)