初一计算与因式分解:①(3a-b)(a+b)(a-b)² ②2(x+2)(x-2)-(x+1)² ③x²(x-y)+(y-x)④x²-y²-x+y ⑤3a³-6a²+3a,快,
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![初一计算与因式分解:①(3a-b)(a+b)(a-b)² ②2(x+2)(x-2)-(x+1)² ③x²(x-y)+(y-x)④x²-y²-x+y ⑤3a³-6a²+3a,快,](/uploads/image/z/745713-9-3.jpg?t=%E5%88%9D%E4%B8%80%E8%AE%A1%E7%AE%97%E4%B8%8E%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%E2%91%A0%283a-b%29%28a%2Bb%29%28a-b%29%26%23178%3B+%E2%91%A12%28x%2B2%29%28x-2%29-%28x%2B1%29%26%23178%3B+%E2%91%A2x%26%23178%3B%28x-y%29%2B%28y-x%29%E2%91%A3x%26%23178%3B-y%26%23178%3B-x%2By+%E2%91%A43a%26%23179%3B-6a%26%23178%3B%2B3a%2C%E5%BF%AB%2C)
初一计算与因式分解:①(3a-b)(a+b)(a-b)² ②2(x+2)(x-2)-(x+1)² ③x²(x-y)+(y-x)④x²-y²-x+y ⑤3a³-6a²+3a,快,
初一计算与因式分解:①(3a-b)(a+b)(a-b)² ②2(x+2)(x-2)-(x+1)² ③x²(x-y)+(y-x)
④x²-y²-x+y ⑤3a³-6a²+3a,快,
初一计算与因式分解:①(3a-b)(a+b)(a-b)² ②2(x+2)(x-2)-(x+1)² ③x²(x-y)+(y-x)④x²-y²-x+y ⑤3a³-6a²+3a,快,
①(3a-b)(a+b)(a-b)² =(3a²+3ab-ab-b²)(a²-2ab+b²)3 4
=(3a²+2ab-b²)(a²-2ab+b²)
=3a4-6a3b+3a²b²+2a3b-4a²b²+2a3b-a²b²+2ab3-b4
=3a4-2a3b-2a²b²+2ab3-b4.
②2(x+2)(x-2)-(x+1)²=2(x²-4)-(x²+2x+1)
=2x²-8-x²-2x-1
=x²-2x-9.
③x²(x-y)+(y-x)=(x-y)(x²-1)
=(x-y)(x+1)(x-1).
④x²-y²-x+y =(x+y)(x-y)-x+y
=(x+y)(x-y)-(x-y)
=(x-y)(x+y-1).
⑤3a³-6a²+3a=3a(a²-2a+1)
=3a(a-1)².
③(x-y)+(y-x)=(x-y)-(x-y)=0④x-y-x+y=(x-x)-(y-y)=0⑤3a-6a+3a=3a×(1-2+1)=3a×0=0 ⊙﹏⊙b汗