As an example, A1: C1 there are three numbers, 1, 3, 5,, you want to make 1 the number of cells where the color is marked, is the meaning of this, right, if it is, and A2: C100 is also similar to this, select A1: C100, Format, Conditional Format, Formulas, the box to enter

=MIN($A1:$C1)=A1

Below Pick a format established to return the color, OK.