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Calculate the formula of each group and observe the relationship between each group. Please sum up this rule, (1) 4 times 9 and 4 times 9 (2) √ 16 times 25 and 16 times 25 (3) √ 0.01 times 0.04 and 0.01 times 0.04 (4) √ 1 / 4 times 16 of 9 and 1 / 4 times 16 of 9 (5) √ 2 × √ 3 = (6) √ a × √ B = [] Observe the relationship between each group and sum up the rule with formula
《5》 = 2 times 3 under the root sign "6" = AB under the root sign
Calculate the following formula What rules are found Write the 1000th formula
1. Calculate the following formula: 1 + 2 + 1 =?
1+2+3+2+1=?
1+2+3+4+3+2+1=?
2. What law can you find? Please express your conjecture with a formula containing one letter: --
3. Write the 1000th formula: --
1+2+3+.+999+1000+1001+1000+999+998+.+3+2+1=1002001
Rule: the nth formula: 1 + 2 + 3 +. + (n-1) + N + (n + 1) + N + (n-1) +. + 3 + 2 + 1 = (n + 1) ^ 2
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