当x=5时,x的五次方+2x的立方+mx+3=4,
得 5^5+2×5³+5m=1
当x=-5时,
x的平方+2x的立方+mx+3
=(-5)^5+2×(-5)³-5m+3
=-5^5-2×5³-5m+3
=-(5^5+2×5³+5m)+3
=-1+3
=2
当x=5时,x的五次方+2x的立方+mx+3=4,
得 5^5+2×5³+5m=1
当x=-5时,
x的平方+2x的立方+mx+3
=(-5)^5+2×(-5)³-5m+3
=-5^5-2×5³-5m+3
=-(5^5+2×5³+5m)+3
=-1+3
=2