已知(x-y)乘(x-y)的三次方乘(x-y)的m次方=(x-y)的12次方 求(4m+2m+1)— 2(2m的二次方-m-5)的值快
问题描述:
已知(x-y)乘(x-y)的三次方乘(x-y)的m次方=(x-y)的12次方 求(4m+2m+1)— 2(2m的二次方-m-5)的值
快
答
(x-y)乘(x-y)的三次方乘(x-y)的m次方=(x-y)的12次方
(x-y)的(1+3+m)次方=(x-y)的12次方.
(x-y)的(4+m)次方=(x-y)的12次方
4+m=12
m=8,
(4m的二次方+2m+1)— 2(2m的二次方-m-5)?
=4m²+2m+1-4m²+2m+10
=4m+11
=4*8+11
=32+11
=43.
答
(x-y)(x-y)^3(x-y)^m=(x-y)^12
(x-y)^(m+4)=(x-y)^12
m+4=12
m=8
(4m+2m+1)-2(2m^2-m-5)
=-4m^2+8m+11
=-4×64+8×8+11
=-181
答
(x-y)乘(x-y)的三次方乘(x-y)的m次方=(x-y)的12次方(x-y)的(1+3+m)次方=(x-y)的12次方.(x-y)的(4+m)次方=(x-y)的12次方4+m=12m=8,(4m的二次方+2m+1)— 2(2m的二次方-m-5)?=4m²+2m+1-4m²+2m+10=4m+11=4...