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 = 10

Trả lời

a)

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 = 61

87 + 0 = 87

0 + 10 = 10