Đáp án:
Bài 3 :
a) 4837 + 1092 = 5929
b) 1802 + 1656 = 3458
c) 14154 + 19946 = 34100
d) 9140 + 1760 = 10900
e) 8947 - 2889 = 6058
f) 8205 - 4815 = 3390
g) 8542 - 5361 = 3181
h) 6668 - 3812 = 2856
Bài 4 :
2 - (2 : 2 + 2 : 2 ) = 2 - ( 1 + 1 ) = 2 - 2 = 0
( 2 + 2 x 2 ) : 2 - 2 = 6 : 2 - 2 = 1
2 - 2 + 2 - 2 + 2 = 2
( 2 x 2 x 2 - 2 ) : 2 = 3
2 x 2 x 2 - 2 - 2 = 4
( 2 x 2 + 2 ) - 2 : 2 = 5
2 x 2 + 2 x 2 - 2 = 6
2 x 2 x 2 + 2 - 2 = 8
2 x 2 x 2 + 2 : 2 = 9