GMAT数学考试高分的公式介绍 9196

(a+b)(a-b)=a2-b2 (a+b)2=a2+2ab+b2 (a-b)2=a2-2ab+b2(a+b)3=a3+3a2b+3ab2+b3 (a-b)3=a3-3a2b+3ab2-b3一元二次方