∑P(5,m,41)c0sa1+Q(5,n,5)os月 +R(5;,7,5)c0sy;AS ∑|P(5,m,4)△S)x+Q(5,m,5AS)x +R(5;,m7,9;)(AS)y 3.取极限λ→0取极限得到流量Φ的精确值 上一页下一页返回i i i i i i i i i n i i i i i R S P Q +  =  + = ( , , )cos ] [ ( , , )cos ( , , )cos 1             i i i i x y yz i i i i x z n i i i i i R S P S Q S ( , , )( ) [ ( , , )( ) ( , , )( ) 1 +  =   +  =          3.取极限  → 0取极限得到流量的精确值