1 nm = 0.000000001 m, then 2.5 nm is expressed as () A. 25 * 10 to the power of 5 (m), 2.5 * 10 to the power of 9 (m) c. 2.5 * 10 to the power of - 10 (m) d2.5 * 10 to the power of 9 (m)

1 nm = 0.000000001 m, then 2.5 nm is expressed as () A. 25 * 10 to the power of 5 (m), 2.5 * 10 to the power of 9 (m) c. 2.5 * 10 to the power of - 10 (m) d2.5 * 10 to the power of 9 (m)

b

If 1nm = 0.000000001m, 260nm is expressed as () m by scientific counting method

If 1nm = 0.000000001m, 260nm is expressed as (2.6x10-7) m by scientific counting method
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The diameter of a certain particle is about 4280 nm, which is expressed by scientific counting method as?

The diameter of some particles is about 4280 nm: 4.28 × 10 ^ - 9 nm

a. B is coprime and a * B is a complete square number. How to prove that a and B are both complete square numbers?

Method 1: let AB = u & sup2; since (a, b) = 1, so a = a (a, b) = (A & sup2;, ab) = (A & sup2;, u & sup2;) = (a, U) & sup2; similarly, B = (b, U) & sup2;. The proof is completed. Method 2: let a = M & sup2; * A1, B = n & sup2; * B1, where a1, B1 are not divisible by any prime square

Given A2 (2 is square) + B2 (2 is square) = 1, it is proved that B / A + 1-A / B + 1 = 2 (B-A) / A + B + 1

If a is a complete square number, then the least complete square number larger than a is______ ．

∵ A is a complete square number, the arithmetical square root of a is a, the number 1 larger than the arithmetical square root of a is a + 1, and the complete square number is: (a + 1) 2 = a + 2A + 1

A and 108 are a complete square number, finding the minimum of A

a*108=a*2*54=a*2*2*27=a*2*2*3*3*3=a*2²*3²*3
The minimum of a is 3

If a is a complete square number, then the least complete square number larger than a is______ ．

∵ A is a complete square number, the arithmetical square root of a is a, the number 1 larger than the arithmetical square root of a is a + 1, and the complete square number is: (a + 1) 2 = a + 2A + 1

270 A is a complete square number. What is the minimum of a

A the minimum is 30

If the product of 2008 * a is a complete square, then a is the smallest

502
Analysis: 2008 = 4 * 2 * 251, it can be seen that when the minimum value of a is 2 * 251 = 502, 2008 * a can be fully opened