§7-2梁的挠曲线近似微分方程\[EIy^{\prime\prime}=\pmM(x)\Rightarrow\frac{M(x)}{EI}=\pmy^{\prime\prime}\]§7-3积分法计算梁的变形\[EIy^{\prime\prime}(x)=-M(x)\]\[EIy^\prime(x)=EI\theta(x)=\int-M(x)dx+C_1\]\[EIy(x)=\int(\int-M(x)dx)dx+C_1x+C_2\