Trường THCS hải Nam
Họ và tên:……………..
Lớp 7B
Kiểm tra môn đại số 7
2 - Thời gian 15’
Ngày tháng 4 năm 2009
§Ị lỴ: Cho 2 ®a thøc: A = -5x
3
+ 4 x
2
y + 7xy + 10x
3
+ 3y
5
- 14xy + 6xy
2
B = -3x
2
y
2
- 5 xy
2
+ 6xy - 3x
2
y + 6x
2
y
2
+ 2x
3
a) Thu gän 2 ®a thøc A vµ B.
b) TÝnh: A + B vµ A - B
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Trường THCS hải Nam
Họ và tên:……………..
Lớp 7B
Kiểm tra môn đại số 7
2-Thời gian 15’
Ngày tháng 4 năm 2009
§Ị ch½n : Cho 2 ®a thøc: f(x) = -10x - x
2
+ 3x
5
+ 2x
4
+ 4x
3
+ 1- 4x
4
+ 5x
G(x) = x
2
- 4x
3
-2 x
2
- 3x + 2x
4
- 1+ 6x
a) Thu gän råi s¾p xÕp 2 ®a thøc f(x) vµ g(x) theo lòy thõa gi¶m dÇn cđa biÕn.
b) TÝnh: f(x) + g(x) theo hµng ngang.
f(x) - g(x) theo cét däc
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