Conversion of ammonium ion to nitrite ion is done by nitrosomonas during nitrification.
13.5% of (100 + ?) = 27
300% of (3341 – 471) = ? × (√4225/195)
30% of 800 - ?2 = 15
38 – 3 2 + 5 2 + 6 2 = ? × 6
4387897 – 3286871 – 51926 = ?
3.55 + 1.05 + 2.5 × 13 – 12% of 12.5 = ?
√14400 x √8100 - (60)² = ? + (80)²
(350/?) = 23 + 33
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