1.

a, 2 x 2 x 2  x2 = 4 x4

b, 4 +4 +4+4 = 4x 4

2.

82 + 37 = 119

24+ 69 = 93

3.a,

(x + 3) : 2 = 6

x + 3      = 6 x2

x + 3      = 12

x           = 12 - 3

x             = 9

câu b, bạn viết sai đề bài rồi

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