2020-2021学年七年级数学苏科版下册《第9章整式乘法与因式分解》易错题型专题训练

2222222222222222222222222222222222222222222021年科七级学册《9整乘法因分》易题专训练附案A＝x2y

B+2nC+

3x

xy+

DA5Ca2

B+xDb+25AB10CD10aba+b＝a2abbaaa

babA0

B1

C2

Dm1x+9A4B242D42yx+ABC673Dx++3xmA3B3D1xyyx+A+cCc

BcDy+bx+56xy10x+2xy+A+3ba+

129x+24+16a

2222222421222222242113+1axa14mm+2n15

31617+22

18ab4

19cm204a

21MABPMBAPPBPBEFMDBPba10221aab+16b2axy+2a23112

212121232222222222222222222121212322222222222222222232333223233S1bS2a103+S324+y2+31xy2x+3xy+25a+6+9的aa9a+8aa1[a1]+21xx2xax3a26x+25xy+y215bab+b27x+4x5+45x1xx51+mx+nmxxx1+mx++4x51mn2+x928

12x5xy

2222222222222222222222222222222222222222x+2xy+Bm+4C+DD

9x

xy+BCDDkx+25k10Da+ba+ba+baa2abba+ba

a

b

a

+b

aaaa1+2am1+92m6m2Dxyxy3xx+2019

22222222222222222222222222222222222222222222xCxxx+3++3xx+3xm3xyyxabycyxyxbc+xyx+y65xyx+4251x

y

++2xyxyx+

2133010x+232yA3+2xy9xxy4y2424+3+baab+6aA27CA121212x+2a4+16a12a16a16

13

3232223232222x++2ax+12xa+2+a+1a+2814+2n+n+2n1+2mn+2m+115

1191622

+2

+2

+2

+2

+2

+2

2222222222222222222BEFPADM2222222222222222222BEFPADM222217x2+2x+4x+44+8+818

ab2a4+b[+b﹣ab]

[4[4+8]19+6aa+12a+36

212a+3612a+36204abab4ab4a+

．21APaBPbAMBM+S阴影正方形正方形eq\o\ac(△,)△a+ba++

2

2244222222212222221222212222244222222212222221222212222232212322222aba+403522aabaaa+44a+4+222[x﹣102xy523SbSabababab2+2abaa10+S+b+﹣100403Sabb+a+bab+S+b303024x+3+3+3+3+9+xxy+632xy3+2x++xy2+343125xxx6+99x3﹣25

22222222222222222222222222222222222222222222222222223233232323232232x3+5x+22xax3ax+2a3x+a

2x+a+2aaax+3a26x+＝y9x+2+xxy+9xx+1717+2xy2542b

a+b3a+151522abab6a+15a+2ab+b15+12ab27x1+4xxxxxx+mx+nx+m1x+nnm1nm0m5521+x90x+xxx+1x+xx9+nxmx+mx

322222222222222223222222222222222