i solved it by ur method!thanks a lot!

i solved it by ur method!thanks a lot!

@tropic ok,i give u a sample about fsolve,u can modify ur source refering to this.

restart;
y1 := 2*a*b^2-b+c-d-1 = 0;
y2 := a^4+b^3-b^2+c-d+2 = 0;
y3 := a*b^2-b+c-d-3 = 0;
y4 := a^3*b^2-b+c-d^3+4 = 0;
fsolve({y1, y2, y3, y4})
⇒{a = -.8479314547, b = -1.535799864, c = 5.596451802, d = 2.132251666}

@tropic ok,i give u a sample about fsolve,u can modify ur source refering to this.

restart;
y1 := 2*a*b^2-b+c-d-1 = 0;
y2 := a^4+b^3-b^2+c-d+2 = 0;
y3 := a*b^2-b+c-d-3 = 0;
y4 := a^3*b^2-b+c-d^3+4 = 0;
fsolve({y1, y2, y3, y4})
⇒{a = -.8479314547, b = -1.535799864, c = 5.596451802, d = 2.132251666}

@maple hi,guy,if u didnt know my answer ,u should tell me,then i will explain that to u in detail.but why u gave me a bed mark?it is unpleasant to me.

@maple hi,guy,if u didnt know my answer ,u should tell me,then i will explain that to u in detail.but why u gave me a bed mark?it is unpleasant to me.

thanks a　lot!!!I enventually solved it!!!!

thanks a　lot!!!I enventually solved it!!!!