de kiem tra 1 tiet toan 7 de 2 19633

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Bài kiểm tra một tiết đề 2
Họ và tờn:
Lớp:
Bài 1 ( 2 điểm) Tính:

(1 + 2 + 3 + ... + 100). 1 − 1 − 1 − 1 .( 6,3.12 − 21.3,6)
3 5 7 9
1 1
1
+ + .... +
2 3
100

Bài 2.( 3 điểm) Tìm x, biết:
a. 2 x − 3 = 5

b. 5 x − 3 − x = 7

Bài 3:(3 điểm) Tìm x, y biết:
a.

x y
= và 2x + y = 20
3 4

c.

x +3 x −3
=

x−2 x+5

d.

x+3 3
=
x −5 2

b. 10 z : 5 y = 20 y và x, y là số tự nhiên.

Bài 4:(2 điểm) Tính x, y, z biết:
x y y z
, = , 2x − 3y + z = 6
3 4 3 5
y + z +1 x + z + 2 x + y − 3
1
=
=
=
b,
x
y
z
x+ y+z

a, =

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