TÌM S T NHIÊN X, BI T
Bài 7: Tìm s t nhiên x, bi t:
ố ự
ế
a)
165 : x = 3
j) (x + 73) – 26 = 76
b)
x – 71 = 129
k) 89 – (73 – x) = 20
c)
22 + x = 52
l) (x + 7) – 25 = 13
d)
2.x = 102
m) 198 – (x + 4) = 12
e)
x + 19 = 301
n) 2(x 51) = 2.2
3
+ 20
f)
93 – x = 27
o) 450 : (x – 19) = 50
i)
25 + ( 35 – x) = 50
p) 71 – (33 + x) = 26
g)
12 + ( 40 + x) = 82
q) (x1)
2
= 25
h)
27 – 3(x + 2) = 6
r) 140 + 2.(x – 3) = 150
i)
70 – 5(x – 3) = 45
t) 70 – 5(x – 3) = 45