《高中数学》全程设计同步配套教学课件（A版选修第二册）第四章 数列_4.1 第2课时 数列的递推公式及前n项和

《高中数学》全程设计同步配套教学课件（A版必修第一册）第四章 指数函数与对数函数_4.1 第1课时 n次方根的概念

Chapter 2 The Particle in a Box 2.1 Differential Equations (linear) A (x)+An-(x)y (n-1) +…+Ay=g(x)

1. General studies of the peptide bond 1.1 The peptide(O=C-N-H) bond was found to be shorter than the C-N bond in a simple amine and atoms attached are coplanar. 1.1.1 This was revealed by X-ray diffraction studies of amino acids and of simple dipeptides and tripeptides. 1.1.2 The peptide (amide) bond was found to be about 1.32 A (C-N single bond, 1.49; C= double bond, 1.27), thus having partial double bond feature (should be rigid and unable to rotate freely)

回顾:线性方程组的解的判定 1.包含n个未知数的齐次线性方程组Ax=0有非零解的充分必要条件是系数矩阵的秩R(A)