-9x²+(x-y)²①1/3m²-3n²②a五次方b-ab③a四次方(m+n)-b四次方(m+n)④已知a+b=2,求1/2a²+ab+1/2b²的值⑤x²-2x-15⑥p²+5pq+6q²+p+3q
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![-9x²+(x-y)²①1/3m²-3n²②a五次方b-ab③a四次方(m+n)-b四次方(m+n)④已知a+b=2,求1/2a²+ab+1/2b²的值⑤x²-2x-15⑥p²+5pq+6q²+p+3q](/uploads/image/z/181478-38-8.jpg?t=-9x%26%23178%3B%2B%EF%BC%88x-y%EF%BC%89%26%23178%3B%E2%91%A01%2F3m%26%23178%3B-3n%26%23178%3B%E2%91%A1a%E4%BA%94%E6%AC%A1%E6%96%B9b-ab%E2%91%A2a%E5%9B%9B%E6%AC%A1%E6%96%B9%EF%BC%88m%2Bn%EF%BC%89-b%E5%9B%9B%E6%AC%A1%E6%96%B9%EF%BC%88m%2Bn%EF%BC%89%E2%91%A3%E5%B7%B2%E7%9F%A5a%2Bb%3D2%EF%BC%8C%E6%B1%821%2F2a%26%23178%3B%2Bab%2B1%2F2b%26%23178%3B%E7%9A%84%E5%80%BC%E2%91%A4x%26%23178%3B-2x-15%E2%91%A5p%26%23178%3B%2B5pq%2B6q%26%23178%3B%2Bp%2B3q)
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-9x²+(x-y)²①1/3m²-3n²②a五次方b-ab③a四次方(m+n)-b四次方(m+n)④已知a+b=2,求1/2a²+ab+1/2b²的值⑤x²-2x-15⑥p²+5pq+6q²+p+3q
-9x²+(x-y)²
①1/3m²-3n²
②a五次方b-ab
③a四次方(m+n)-b四次方(m+n)
④已知a+b=2,求1/2a²+ab+1/2b²的值
⑤x²-2x-15
⑥p²+5pq+6q²+p+3q
-9x²+(x-y)²①1/3m²-3n²②a五次方b-ab③a四次方(m+n)-b四次方(m+n)④已知a+b=2,求1/2a²+ab+1/2b²的值⑤x²-2x-15⑥p²+5pq+6q²+p+3q
①1/3(m²-9n²)=1/3(m+3n)(m-3n)
②ab(a⁴-1)=ab(a²+1)(a²-1)=ab(a²+1)(a+1)(a-1)
③(m+n)(a⁴-b⁴)=(m+n)(a²+b²)(a²-b²)=(m+n)(a²+b²)(a+b)(a-b)
④1/2(a²+2ab+b²)=1/2(a+b)²=1/2*2²=2
⑤(x+3)(x-5)
⑥(p+2q)(p+3q)+(p+3q)=(p+2q+1)(p+3q)
又不懂再问
忘了标题了 (x-y)²-9x²=(x-y+3x)(x-y-3x)=(4x-y)(-2x-y)