求助帖，一直正在运行

bj90sunsun

d1 = 400; d2 = 760; l = 1000; v1 = 1.47; v2 = 2.11; v = 1.5;
& x( R9 T/ U  A3 ?: N6 RSolve[{(v2 + 1) Cos[x2] Sin[x1]^2 +
    v Cos[x2]^2 == (v1 + 1) Cos[x1] Sin[x2]^2 + v Cos[x1]^2,
  d1 v1 Sin[x2] + d2 v2 Sin[x1] +
) B4 y- t+ [. }" i$ V$ O. @    v (d1 Cos[x1] Sin[x2] + d2 Sin[x1] Cos[x2]) ==
   l v Sin[x1] Sin[x2]}, {x1, x2}]
& z& }& ~9 v  X5 }& K我用的是mathematics 9，是式子出了问题还是我自己电脑不给力，求大神解答。mathematics菜求教~

Rain326

多考虑一下吧.........

402

d1 = 400; d2 = 760; l = 1000; v1 = 1.47; v2 = 2.11; v = 1.5;
( t/ k3 H0 F) H4 V0 G% |" O4 P8 C2 W2 _; BReduce[{(v2 + 1) Cos[x2] Sin[x1]^2 + 8 p9 K) d" k" L# w% c% M; M4 @
    v Cos[x2]^2 == (v1 + 1) Cos[x1] Sin[x2]^2 + v Cos[x1]^2,
/ u5 v8 ?2 G, q6 v' S6 z2 Z3 k( M  d1 v1 Sin[x2] + d2 v2 Sin[x1] +
4 v/ O( V2 K* u* c2 f0 C    v (d1 Cos[x1] Sin[x2] + d2 Sin[x1] Cos[x2]) == 5 b: e8 Z) J% o0 d7 ~9 T
   l v Sin[x1] Sin[x2]},
( ?" f" z* V0 J  l$ T# M+ y& u1 |# V; V# V0 V. I7 J. b {x1, x2}, Reals]

joy81890

试试这个：

d1 = 400; d2 = 760; l = 1000; v1 = 1.47; v2 = 2.11; v = 1.5;
Reduce[{(v2 + 1) Cos[x2] Sin[x1]^2 +
    v Cos[x2]^2 == (v1 + 1) Cos[x1] Sin[x2]^2 + v Cos[x1]^2,
' T+ n0 J6 C2 O  d1 v1 Sin[x2] + d2 v2 Sin[x1] +
8 S7 x, U8 i' C' v" d    v (d1 Cos[x1] Sin[x2] + d2 Sin[x1] Cos[x2]) ==
4 o: Q2 {/ D- i/ O   l v Sin[x1] Sin[x2]},
8 B. [+ M$ s' o- V1 ?2 O1 H {x1, x2}, Reals]

joy81890

试试这个：  d1 = 400; d2 = 760; l = 1000; v1 = 1.47; v2 = 2.11; v = 1.5; Reduce[{(v2 + 1) Cos[x2] Sin[x1]^2 +      v Cos[x2]^2 == (v1 + 1) Cos[x1] Sin[x2]^2 + v Cos[x1]^2,    d1 v1 Sin[x2] + d2 v2 Sin[x1] +      v (d1 Cos[x1] Sin[x2] + d2 Sin[x1] Cos[x2]) ==     l v Sin[x1] Sin[x2]},  {x1, x2}, Reals]