-9x²+(x-y)²
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-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
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
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)
再问: (x-y)²-9x²=(x-y+3x)(x-y-3x)=(4x-y)(-2x-y)
⑥(
p+2q)(p+3q)+(p+3q)=(p+2q+1)(p+3q)
解释解释,ok?
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)
再问: (x-y)²-9x²=(x-y+3x)(x-y-3x)=(4x-y)(-2x-y)
⑥(
p+2q)(p+3q)+(p+3q)=(p+2q+1)(p+3q)
解释解释,ok?
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