帮忙解答一道初一数学的题目!!谢谢大家

当x=-3时,代数式ax^5+bx^3+cx-8=6,求当x=3时,代数式ax^5+bx^3+cx-8的值
2024-11-27 15:31:33
推荐回答(4个)
回答(1):

当x=-3时,a(-3)^5+b(-3)^3+c(-3)-8=6
=>-(a3^5+b3^3+c3)=8+6=14
=>a3^5+b3^3+c3=-14
所以,当x=3时,
ax^5+bx^3+cx-8
=a3^5+b3^3+c3-8
=-14-8=-22

代数式ax^5+bx^3+cx-8的值是-22

回答(2):

当x=-3时,a(-3)^5+b(-3)^3+c(-3)-8=6
=>-(a3^5+b3^3+c3)=8+6=14
=>a3^5+b3^3+c3=-14
所以,当x=3时,
ax^5+bx^3+cx-8
=a3^5+b3^3+c3-8
=-14-8=-22

回答(3):

x为负数时 它的奇数次幂与偶数次幂互为相反数 x=-3 ax^5+bx^3+cx=14 所以x=3 ax^5+bx^3+cx=-14 ax^5+bx^3+cx-8=-22

回答(4):

5 3 1是单数,所以当x=-3时的ax^5+bx^3+cx=-(当x=3时ax^5+bx^3+cx
ax^5+bx^3+cx-8=6则当x=-3时的ax^5+bx^3+cx=14
当x=3时ax^5+bx^3+cx=-14
-14-8=22