150道八年级上册数学计算题!有答案,有过程!
1个回答
展开全部
1.-a2+b2=(b+a)(e799bee5baa6e79fa5e98193e78988e69d8331333332396139b-a)
2.(x-1)2-2(x-1)+1
解:原式=(x-1-1)2
=(x-2)2.
3.8x2-10x+2
解:原式=2(4x2-5x+1)
=2(4x-1)(x-1)
=(4x-1)(2x-2)
4.2a2-4a
解:原式=2a(a-2)
5.4x2-4x+1=(2x-1)2
6.a4b-6a3b+9a2b
解:原式=a2b(a2-6a+9)
=a2b(a-3)2
7.x(x-y)-y(x-y)=(x-y)2
8.x2y-4y
解:原式=y(x2-4)
=y(x2-22)
=y(x+2)(x-2)
9.2x2-4x+2
解:原式=2(x2-2x+1)
=2(x-1)2
10.m2-16=(m-4)(m+4)
11.m2+4m=m(m+4)
12.m2-8m+16=(m-4)2
13.a2-2a+1=(a-1)2
14.x2+2x+1=(x+1)2
15.x2-y2-2y-1
解:原式=x2-(y2+2y+1),
=x2-(y+1)2,
=(x+y+1)(x-y-1)
16.(6x2-3x)-2(7x-5),
解:原式=6x2-3x-14x+10
=(6x-5)(x-2)
17.a3-4ab2
解:原式=a(a2-4b2)
=a(a+2b)(a-2b)
18.x3-2x2+x
解:原式=x(x2-2x+1)
=x(x-1)2
19.x2-6x+9=(x-3)2
20.mx2-6mx+9m,
解:原式=m(x2-6x+9),
=m(x-3)2
不好意思,我打了20分钟左右,太累了,你可以去菁优网搜,里面好多的,解析都在里面。
2.(x-1)2-2(x-1)+1
解:原式=(x-1-1)2
=(x-2)2.
3.8x2-10x+2
解:原式=2(4x2-5x+1)
=2(4x-1)(x-1)
=(4x-1)(2x-2)
4.2a2-4a
解:原式=2a(a-2)
5.4x2-4x+1=(2x-1)2
6.a4b-6a3b+9a2b
解:原式=a2b(a2-6a+9)
=a2b(a-3)2
7.x(x-y)-y(x-y)=(x-y)2
8.x2y-4y
解:原式=y(x2-4)
=y(x2-22)
=y(x+2)(x-2)
9.2x2-4x+2
解:原式=2(x2-2x+1)
=2(x-1)2
10.m2-16=(m-4)(m+4)
11.m2+4m=m(m+4)
12.m2-8m+16=(m-4)2
13.a2-2a+1=(a-1)2
14.x2+2x+1=(x+1)2
15.x2-y2-2y-1
解:原式=x2-(y2+2y+1),
=x2-(y+1)2,
=(x+y+1)(x-y-1)
16.(6x2-3x)-2(7x-5),
解:原式=6x2-3x-14x+10
=(6x-5)(x-2)
17.a3-4ab2
解:原式=a(a2-4b2)
=a(a+2b)(a-2b)
18.x3-2x2+x
解:原式=x(x2-2x+1)
=x(x-1)2
19.x2-6x+9=(x-3)2
20.mx2-6mx+9m,
解:原式=m(x2-6x+9),
=m(x-3)2
不好意思,我打了20分钟左右,太累了,你可以去菁优网搜,里面好多的,解析都在里面。
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询