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Delimiter between question and answer:

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1 ppb
Por mil millones: 1 ppb = 1/1000000000 , 10 ppb × 30 = 3 × 10^-7 
1 ppm
Por millón: 1 ppm = 1/1000000 , 10 ppm × 30 = 0,0003
Por milla: 1 ‰ = 1/1000 , 10‰ × 30 = 0,3
%
Por ciento 1% = 1/100 , 10% × 30 = 3
√a=b
Raíz: √16=4
a ^ b
Exponente: 4^3=64
÷ , / , -
división o fracción: 6÷3=2 , 6/3=2
* , x , .
Multiplicación: 2*3 =6 , 2x3=6 , 2.3 =6 , (2)(3)=6
±
Mas menos : 3 ± 5 = 8 o -2
( ) , [ ] , { }
Paréntesis 2+(4x2)=10 , Soportes 2[(1+2) × 3] = 18 , Llaves 2{1+[(4÷2) × 3]÷2} = 8
≤ , ≥
Menor o igual que x≤1, Mayor o igual que x≥1
< , >
menor que 4<5, mayor que 5>4
aproximación: π≈3.1416
= , ≠
igualdad 5 = 2 + 3, desigualdad 5 ≠ 4