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The fourth grade mathematics summer vacation paradise Book 2 answers
30=2*3*5 42=2*3*7 70=2*5*7 105=3*5*7 175=5*5*7 245=5*7*7

It can be seen that these six numbers are divided into three groups, and each group has a factor of 2, 3, 5, 5, 7 and 7.

So, divide these six numbers into 30 and 245; 42、 175; 70, 105 three groups, the product of each group is the same.