考研数学公式大全(考研必备)

= 0(x, y)\rdx dy\r.u(x, y) = C /0%0p?)123\r45p?\r/(X):00P`\r6 + Q(x)y = /(x),8\rdx“ /(x)w00@P`\r45<=(P`>?p?@+2A\r(*)y"+py' + qy = 0 , +"p,q0<(F\rG2HI\r1?JKLMp?0 ) N+OP+ 4 = 0 , +"RP)=(@<(STU%(*)V"y",y ,y)=(;\r2?GK(A)V)YZ[.\r3?[^_, 2) ` a b c defJK(*)V)12:\r(*)V)12\r\ g)hV\rYZ`ijk[(p2l4q>0) y = c er'x +c er2X\r[ 2\rYZijk[(p2l4q = 0) y = (q +c x)er'x\r2\rnopqr[(p2l4q<0) y = eax(c cos /Jr + c sin J3x)\r] 2\rr= a + i/3, r2 -a-i(3\rP " M r ?\r2 2\r45<=(@P`>?p?\ry"+py' + qy = /(x), 0<(\r/(x) = e*,(x)| 40< ( F\rf(x) = e^[P, (x) cos a>x + Pn (x) sin 5 ] |