“1”在初数解题中的妙用

Replace ingeniously "1" in solving elementary mathematical problems

“1”有时可用n×1/n[(n+P)-p]、a°(a≠1),Log_a^a(a>0,a≠1)、Log_a^b·Log_b^a、1~n、sin^2x+cos^2x、tgπ/4、ctgπ/4、tgx·ctgx……来代替,使初等数学解题来得简便,从而提高解题能力。

We can replace '1' by n×1/n,1/n[(n + p) -P], a°(a≠1), Logaa (a>0,a≠1),LogabLogba,1n, sin2α+cos2α, tg π/4, ctg π/4, tgαctgα… insmetiones, It simplifies greafly processes of solving problems and impoves efficiently abilities in elementary mathmatics.