Joke Collection Website - Talk about mood - Please divide these formulas into two categories and talk about the laws in calculation. 24x 1 1 22x28 35x35。
Please divide these formulas into two categories and talk about the laws in calculation. 24x 1 1 22x28 35x35。
The first category: formulas with the same front numbers and complementary back numbers (add up to 10).
The simple calculation method is: the first two numbers = the first number × (the first number+1), and the last two numbers = the last number × the last number.
Such as: 22× 28 = 6 16, 35× 35 = 1225.
The second category: formulas with a factor of 1 1.
The simple calculation method is: pull on both sides and add in the middle.
Such as: 24× 1 1=264.
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