kiêm tra chương 3 Đs 8
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Trổồỡng THCS Phong Myợ KIỉM TRA CHặNG III
ệ S II
Mọn : aỷi Sọỳ 8
Thồỡi gian : 45 phuùt.
Hoỹ vaỡ tón :.............................................................Lồùp :...............
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Cỏu 1(3õ): Phổồng trỗnh x
3
- x
2
- (4x - 4) = 0 coù tỏỷp nghióỷm
laỡ :
a)
}
{
1; 2;4S =
b)
}
{
1; 2;2S =
c)
}
{
2;4;3S =
d)
}
{
1; 2S =
Cỏu 2(3õ) : Nghióỷm cuớa phổồng trỗnh
2
4 1
2 6
2
x
x
x
+
=
laỡ :
a) 1,3 . b)
1
3
. c)
1
12
. d) Sọỳ khaùc.
Cỏu 3 (4õ): Beù Lan õi sióu thở mang theo sọỳ tióửn laỡ 620 õọửng
õóứ mua mọỹt sọỳ vồớ vaỡ buùt. Giaù mọứi cuọỳn vồớ laỡ 25 õọửng , buùt
laỡ 15 õọửng. Bióỳt rũng, Lan õaợ mua õổồỹc sọỳ buùt vaỡ vồớ tọứng
cọỹng laỡ 30. Vỏỷy Lan õaợ mua bao nhióu buùt, bao nhióu vồớ ?
Baỡi laỡm:
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