Số?
Số?
a) 34 + 99 = + 34
13 + 297 = 297 +
201 + 118 = + 201
b) 9 + = 9
61 + = 61
(24 + 8) + 12 = 24 + (8 + )
8 + 6 + 4 = 8 + (6 + )
63 + 37 + 98 = (63 + ) + 98
+ 0 = 87
+ 10 = 10Hoặc
Số?
a) 34 + 99 = + 34
13 + 297 = 297 +
201 + 118 = + 201
b) 9 + = 9
61 + = 61
(24 + 8) + 12 = 24 + (8 + )
8 + 6 + 4 = 8 + (6 + )
63 + 37 + 98 = (63 + ) + 98
+ 0 = 87
+ 10 = 10a)
34 + 99 = 99 + 34
13 + 297 = 297 + 13
201 + 118 = 118 + 201
(24 + 8) + 12 = 24 + (8 + 12)
8 + 6 + 4 = 8 + (6 + 4)
63 + 37 + 98 = (63 + 37) + 98
b)
9 + 0 = 9
61 + 0 = 6187 + 0 = 87
0 + 10 = 10