X x 40 = 80
X = 80:40
X = 2
Chúc bạn may mắn!
X x 40 = 80
X = 80 : 40
X = 2
Chúc bạn may mắn!
x + 80 = 40 x 3
Tìm x :
x + 80 = 40 x 3
Tìm x :
x + 80 = 40 x 3
x + 80 = 40 + 50
tim x
x + 50 = 100
x + 40 = 80
ai tick minh minh tick lai
Điền > < =
44 : 4 x 5 ..... 52
41 ..... 68 - 20 - 7
47 ..... 80 + 8 - 40
Đúng ghi Đ, sai ghi S:
a) 86 – 16 = 70 
b) 23 x 2 – 1 = 23 
c) 250 : 5 + 5 = 25 
d) 40 + 80 : 4 = 30 
e) 80 + 4 : 2 = 42 
f) 70 + 30 : 2 = 50 
g) 90 + 30 x 3 = 180 
h) 70 + 30 : 2 = 85 
Find the values of these espressions :
25 - (20 - 10)
80 - (30 + 25
125 + (13 + 7)
416 - (25 - 21)
(65 + 15) x 2
46 : (6 : 3)
(74 - 14) : 2
81 : (3 x 3)
123 x (42 - 40)
(100 + 11) x 9
72 : (2 x 4)
64 : (8 : 4)
20 × 20
40 × 40
60 × 60
80 × 80
100 × 100
