Fill in the blanks (4 points for each small question), ***60 points. ) 1.8. 1× 1.3-8÷ 1.3+ 1.9× 1.3+ 1 1.9÷ 1.3=________。 The elevation divisor and elevation factor in the ingenious calculation of the 456-level test center. Analytical solution (8.1+1.9) ×1.3+(11.9-8) ÷1.3 =1. Test center calculation, equation thought, inverse method of reduction problem. Analysis and solution (3-3/7) ÷ (2/3) = 27/7 3. If so, the largest of A, B and C is _ _ _ _ _ _ _ _ _ _ _ _. Comparison of test sites: There are two commonly used methods, Mr. Hu Xianyou's so-called "same difference method" and "reciprocal method". Analysis and solution can be seen, so the relationship between A, B and C is A.