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Algebraic evaluation of mathematics classification assembly in 20 16 senior high school entrance examination
1, simplification evaluation: 6x square -(2x+ 1)(3x-2)+(x+3)(x-3), where x = 1/2 (important process) solution: original formula = 6x2-(6x2-x). Original formula =1/4+1/2-7 =-25/42, factorization: the square of -4a +24a-36 (important process) solution: original formula =-4 (a 2-6a+9) =-4 (a-3).