Divide the eight numbers 34, 38, 51, 55, 57, 65, 77 and 91 into two groups with four numbers in each group to make their products equal, Let's use the equation to express these two groups of equal multiplication,

Divide the eight numbers 34, 38, 51, 55, 57, 65, 77 and 91 into two groups with four numbers in each group to make their products equal, Let's use the equation to express these two groups of equal multiplication,

34=2×17
38=2×19
51=3×17
57=3×19
55=5×11
65=5×13
77=7×11
91=7×13
So 34 × 57 × 55 × 91 = 38 × 51 × 65 × 77