(4/7X+5)/(x/5)=3/5,求X等于多少,怎么算

用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. (x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? 如果1+x+x^2+x^3=0,求x+x^2+X^3+x^4+x^5+x^6+x^7+x^8的值, 已知x=2π+1求 |x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|+|x-7|+|x-8|+|x-9|+|x-10| 已知x=2π+1.求(X-1)+(X-2)+(X-3)+(X-4)+(X-5)+(X-6)+(X-7)+(X-8)+(X-9)+(X-10) x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? 已知3x*x-x=1,求6x*x*x+7x*x-5x+2000 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少 求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X 7x-6+5x+1=4x+3-2x求x是多少 [(x-3)/(x-7)]+1=(x-5)/(x-4),求x的值. (16x-13)/(4x-3)-(20x-24)/(4x-5)=(32x-30)/(8x-7)-(40x-43)/(8x-9)求x X+2分之X+3-X+4分之X+5=X+6分之X+7-X+8分之X+9,求X的值 求方程解x-5/x-4+x-9/x-8=x-8/x-7+x-6/x-5 x-4／x-5-x-5／x-6=x-7／x-8-x-8／x-9求大神帮助 matlab中a(x)=x^4+3x^3+9x-18 b(x)=x^5-4x^3-18x+7 c(x)=x^7+6x^5+9x^3-5x^2-2 d(x)=x^9-8x^7+6x^5-4x^4+d(x)=x^9-8x^7+6x^5-4x^4+6x^2+3 求e(x)=a(x)*b(x)*c(x)*d(x) *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||