Tính nhẩm:
5000 + 100 = ..................
7400 - 400 = ..................
2000 3 + 600 = ..................
8000 : 2 + 2000 = ..................
6000 - (5000 - 1000) = ..................
6000 - 5000 + 1000 = ..................
7000 - 3000 x 2 = ..................
(7000 - 3000) x 2 = ..................
x + 1000 = 5000 + 5000
x + 2000 = 5000 + 5000
3000 x 6 - 5000
X + 200 = 5000
x+5000=10000
Tính nhẩm: 5000 x 2 =
1000 + 2000 + 5000 + X = 10000
tìm X
1000 + 1000 + 1000 + 1000 + X = 5000
tìm X