七年级数学北师大版下册《第1章整式的乘除》单元综合培优提升训练

1、2 2 2 2 x 2 2 x y 2 x3m n 2 2 2 2 2 52 8 43 2 2 2 2 2 m 2 2 2 2 x 2 2 x y 2 x3m n 2 2 2 2 2 52 8 43 2 2 2 2 2 m 1 +1 m 4 4 m4 4 2 2 2 2 2 2 2 32 北大 年七级数下 1 章整式乘元合优升练附案 xy+5 7y xy A0 B1 C D12 1 1 x 1 + a102 4a b ABCD a 2 +2 A8 B7 C +3ab ab 2DaA B3 C5 D7ab A Ca a B2x Dm 3m 2mb 7b a + ab A10B103 CD20 x

2、+bx +mx a A2 B4 C6 D x x A4xBC2xD x x +1 +1 M AMN BM N D10 x px+q x+7 x p Apq B18 Cp518 Dpq18 0.00000012 12 4x +49 a b c b +c3b 2 2 2 2 na b c 2 2 2 2 2 2 3 y + x2 2 3 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 a b c b +c3b 2 2 2 2 na b c 2 2 2 2 2 2 3 y + x2 2 3 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2

3、 13 kkk 92+a2 a 14 x xx3 +2+11x 15 3 +1 16 a 2 10 80 a4039bc 17 x x2020+2022 x2021 18c+42b2c 1934 + 204 2y15x xy 211x +x+ x 2 a a + 3 + 22 x 3010160 x +x10 xx3010160+30 x 20 +x10 a +b a 20 21601 x x2x + 2 x x 2018 ABCD ABBC12 F CD DFx CE ABCD CEMN CEPF 160 231100 2002 2 3 22 32 2 22 2 2 2 3 22 32 2

4、22 2 2 2 3 2 2 22018202024+341x x25 +4y 2 26 x123456789123456787 x y xa+1 2ya axya a a20 xy5.4563.456 1.456 272+ 2+26 x y32 2 2 2 2 2 x 0 2 2 2 +2 m 22 22 2 2 2 2 2 2 x 0 2 2 2 +2 m 22 22 2 22 2 3 62 8 23 2 2 2 2 22 22 2xyxy5 +9yx xy+9y 24 xyx yxy xy3155C 1 x A B a + ab 42aDC a a 3 a a +b a +3ab C a

5、 B14x Ca D m 2 Da 7b 13a + 7 + +2+ +b 2 +1 m m+1 （ 2 +1 m m+1 （ （m ）+2m m2 2 4 22 2 4 24 24 22 2 2 2 4 3 2 2 372 2 2 ab xbx 12 1b m a1b 11 a26 a2b6 a34 a3b4 6 Cm x x x 4x x 4x D x +2+1 2x+1 2x N +1 x +x +1M x x +x +1 x 0 3x 10 x+q5x +p5x +x7p5x p05pq 5q0.000000121010 712x 28x+7 27 a b 2 3 a b c a c

6、b+ b+a b 2 3 a b c a c b+ b+ +c 2+a 2a b2 3 22 2 2 2 2 2 2 22 2 m 2 2 n n+1m na b c b 1 3 m282813 27 3 a bk k 9k k k ab2 2 b2 2a2329 27 3 14x x60 x 26x3 +x1xx 6 2x 3x x+83x x+86+8 2615 3 9 5 3 9 99 9 910 162019a4039+20202019a2019b2020+2020c2019b 2 52 10 2 82 b132 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2

7、2 2 2 2 2 2 2 2 3 4 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 4 2 2 2 32 3 42 2 2 2 2 2 22 22 1+20204041 172020 + x2021+1 +x2021 8 x2021y+1 y y +2y+1+y y+18 2y y 3x 31832b 3+43b 163bb bc9cb bc 6b 11c +1619423aa2 a4 242+aa +a 3a +a 101020 x y x xy 12 y xy + x y xy 15x y 2x x xyx 2

8、12x 23 a+1 a a 02 2 2 2 2 22 2 2 2 2 2 2 22 2 2 2 2 2 2 2 22 2 2 2 2 2 2 2 2 22 2 2 2 2 2 2 22 2 2 2 2 2 2 22 2 2 2 2 2 2 2 22 2 2 2 2 2 2 2 2 22 2 2 2 2 2 3 2 2 3 2 2 2 6 6 2 4 6 6 66 a 3a +a 27222020 xxbab+ x201642020 x + + + 2ab 1212 xax2018b x 2018 a 2020a 2021x +b + 3 2020 x 3FC2012x 20 x20160 x 12 20 x12bxab+x+x12 8 x + 20 + x a ab 2 8 38423 200100 11001 1001 1 220182020 12019+12019 2019 1 24x 4x +4x+ 4+4x 5 x1 1 525y +4y2 4y4y 4y y 26