(x-3)^5 = a1x^5 + a2x^4 + a3x^3 + a4x^2 + a5x + a6求:(1)a1 + a2 + a3 + a4 + a5 + a6(2)a2 + a3 + a4 + a5注:(x-3)^5等于x减3的差的五次方a1 就是 a 一最好用杨辉三角解!
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(x-3)^5 = a1x^5 + a2x^4 + a3x^3 + a4x^2 + a5x + a6求:(1)a1 + a2 + a3 + a4 + a5 + a6(2)a2 + a3 + a4 + a5注:(x-3)^5等于x减3的差的五次方a1 就是 a 一最好用杨辉三角解!
(x-3)^5 = a1x^5 + a2x^4 + a3x^3 + a4x^2 + a5x + a6
求:
(1)a1 + a2 + a3 + a4 + a5 + a6
(2)a2 + a3 + a4 + a5
注:(x-3)^5等于x减3的差的五次方
a1 就是 a 一
最好用杨辉三角解!
(x-3)^5 = a1x^5 + a2x^4 + a3x^3 + a4x^2 + a5x + a6求:(1)a1 + a2 + a3 + a4 + a5 + a6(2)a2 + a3 + a4 + a5注:(x-3)^5等于x减3的差的五次方a1 就是 a 一最好用杨辉三角解!
1.取x=1,则等式右端=a1+a2+a3+a4+a5+a6,等式左端=(1-3)^5=-32.
2.(x-3)^5展开,x^5得系数为1,常数项为:(-3)^5.所以a1=1,a6=(-3)^5.所以a2+a3+a4+a5=32-1-(-3)^5=274.
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