2 . a-0. 1 = b+ 1a & gt； b

3.a×0. 1=b÷ 10 a=b

4.a÷0. 1=b× 10 a=b

5.b/a is the true score a >；; b

6.c/a=c/b(a is not equal to 0, and B is not equal to 0), and A = B.