最好在23点以前~(最好有过程的!)1) 4a^2+2a-b-b^22) 2pq-p^2+1-q^23) x^2+2xy+y^2-3x-3y+2
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最好在23点以前~(最好有过程的!)1) 4a^2+2a-b-b^22) 2pq-p^2+1-q^23) x^2+2xy+y^2-3x-3y+2
最好在23点以前~(最好有过程的!)
1) 4a^2+2a-b-b^2
2) 2pq-p^2+1-q^2
3) x^2+2xy+y^2-3x-3y+2
最好在23点以前~(最好有过程的!)1) 4a^2+2a-b-b^22) 2pq-p^2+1-q^23) x^2+2xy+y^2-3x-3y+2
1) 4a^2+2a-b-b^2
=(4a^2-b^2)+(2a-b)
=(2a-b)(2a+b)+(2a-b)
=(2a-b)(2a+b+1)
2) 2pq-p^2+1-q^2
=1-(p^2-2pq+q^2)
=1-(p-q)^2
=(1+p-q)(1-p+q)
3) x^2+2xy+y^2-3x-3y+2
=(x+y)^2-3(x+y)+2
=(x+y-1)(x+y-2)
读一下
4a²-2a-b-b²
=(4a²-2a+1/4)-(b²+b+1/4)
=(2a-1/2)²-(b+1/2)²
=[(2a-1/2)+(b+1/2)][(2a-1/2)-(b+1/2)]
=(2a+b)(2a-b-1)
2pq-p²+1-q²
=1-(p²-2...
全部展开
4a²-2a-b-b²
=(4a²-2a+1/4)-(b²+b+1/4)
=(2a-1/2)²-(b+1/2)²
=[(2a-1/2)+(b+1/2)][(2a-1/2)-(b+1/2)]
=(2a+b)(2a-b-1)
2pq-p²+1-q²
=1-(p²-2pq+q²)
=1²-(p-q)²
=[1+(p-q)][1-(p-q)]
=(1+p-q)(1-p+q)
x²+2xy+y²-3x-3y+2
=(x²+2xy+y²)-3(x+y)+2
=(x+y)²-3(x+y)+2
=[(x+y)-1][(x+y)-2]
=(x+y-1)(x+y-2)
收起
(1) 原式=4a^2-b^2+2a-b=(2a-b)(2a+b)+(2a-b)=(2a-b)(2a+b+1)
(2)原式=1-(p^2-2pq+q^2)=1-(p-q)^2=(1-P+q)(1+p-q)
(3)原式=(x+y)^2-3(x+y)+2=(x+y-1)(x+y-2)
1) 4a^2+2a-b-b^2
=(4a²-b²)+(2a-b)
=(2a+b)(2a-b)+(2a-b)
=(2a+b+1)(2a-b)
2) 2pq-p^2+1-q^2
=-(p²-2pq+q²)+1
=1-(p-q)²
=(1+p-q)(1-p+q)
3) x^2+2xy+y^2-3x-3y+2
=(x+y)²-3(x+y)+2
=(x+y-2)(x+y-1)
1) 4a^2+2a-b-b^2
=(2a+b)(2a-b)+(2a-b)
=(2a-b)(2a+b-1)
2) 2pq-p^2+1-q^2
=-(p^2-2pq+q^2)+1
=-(p-q)^2+1
=1-(p-q)^2
=(1+p-q)(1-p+q)
3) x^2+2xy+y^2-3x-3y+2
=(x+y)^2-3(x+y)+2
=(x=y-2)(x+y-1)
4a^2+2a-b-b^2=(2a+b)(2a-b)+(2a-b)=(2a-b)(2a+b+1)
2pq-p^2+1-q^2=-(p-q)^2+1=(1-p+q)(1+p-q)
x^2+2xy+y^2-3x-3y+2=(x+y)^2-3(x-y)+2=(x+y-1)(x+y-2)
不过最好还是自己做的好哦!
1)第一题是不是你打错了
2)1-(p+q)^2
3)(x+y)^2-3(x+y)+2=(x+y-1)(x+y-2)
看不懂。
^是什么?