88计算莫尔积分的图乘法(138) 1、图乘法的推导 M(x) 「 xM(r)dx为图M轴坐标的静矩 C为图Mx)的形心,x为其坐标 xM(xdx=oxc x 「M(x)M(xdx M(r) FA M(x)dx+bx. M(x)dx 0 A+B·O·x=o(A+B·xc) Q·Mc(A+Bω xc C M(x) x x M(x) l ( ) ( )d l M x M x x 0 0 = ( )d ( )d + l l A M x x B x M x x C 为图M(x)的形心,xc 为其坐标 为图M(x)对y轴坐标的静矩 0 ( )d l xM x x 0 ( )d = l C xM x x x = ( ) A B x A B x + = + C C =MC ( ) + = C A B x M C 1、图乘法的推导 8.8 计算莫尔积分的图乘法(13.8)