初一升初二数学暑期衔接教?- 百度文库 ر

ֽ̡㡢ס

8㣺2?3?2?3?3?22?3?22

94?15?4?15?23?5

ѡ⣺93?22ֵڣ A3?2 B3?1 C3?2 D2?1

10x?y?73?52,x?y?72?53ôxyֵǣ A33?32

B33?32

C5?3 D72?53

118?215ã A3?5

B5-5

C5?3 D3?5

12ʽ

3x?2x?3?3x?2x?3ǣ Ax??23 Bx?3 Cx?3 Dx??23x?3

13ʽ

a??ab?b?x?a?a?yʵΧڳ- 49 -

ֽ̡㡢ס

3x2?xy?y2axyͬʵx2?xy?y2ֵǣ A3 B13 C2 D-3

ڰ˽ ĸ

֪ʶҪ㡿

1θʽĶ壺

һأһxƽa,x2=a(a0)ôdzxΪaƽҲaĶηaɳΪθʽ 2ĸĶ壺

ѷĸеĸŻȥĸ 3ʽ

жθʽĴʽˣǵĻжθʽ˵ʽΪʽ 4ʽȷ

ٵθʽaa=aȷ磺aaa?ba?ba?ba?bȷֱΪ

θʽƽʽa+b(a-b)ȷ

磺a+ba-b,a-b,ax+by

ax-byֱΪʽ 5ĸķ벽裺 Ƚӡĸθʽ

ڽӡĸԷĸʽʹĸвʽ

θʽʽ

1 иʽ

48 160 75

- 50 -

ֽ̡㡢ס

210.5 ݣ ޣ

23?3242

2 㣺

3 ȽϴС

7?66?5 5?38?3

4 ֪x=3,y=

- 51 -

1102 ࣻ ᣻

6?77?33?12 340

33?2

x?y

x?y

x?y?2xyx?y

1x1?3y??xyֵ ,xx42 ֽ̡㡢ס 5 ֪a=

6 ֵa=2+3,b?2?3.

7 6+13ּΪaСּΪb

1a+= b

11bb,b=ֵ ?23a?ba?ba?abab?b?ab?ba?ab

ϰ 1.㣺 1 3?

- 52 -

436 252?1 51231?1 421?33? 242711