(1-1/4)x(1-1/9)x(1-1/16)x

(1-1/4)x(1-1/9)x(1-1/16)x.x(1-1/81)=?

1个回答

(1-1/4)x(1-1/9)x(1-1/16)x.x(1-1/81)
=(1-1/2)x(1+1/2)x(1-1/3)x(1+1/3)x(1-1/4)x(1+1/4)x.x(1-1/9)x(1+1/9)
=1/2x3/2x2/3x4/3x3/4x5/4x.x8/9x10/9
=1/2x10/9
=5/9

比如1+x+x*(x+1)=(x+1)^2 和 81+81*8=81*9=729>700
(x+4)(x^2+16)(x-4),(x-1/3)（x^2+1/9)(x+1/3),
1/(1+x)+2/(1+x^2)+4/(1+x^4)+8/(1+x^8)=0 求16/(1-x^16)-1/(1-x)
计算（x+1/x)(x2+1/x2)(x4+1/x4)…（x16+1/x16)(x2-1)
（x+1/x）（x2+1/x2）（x4+1/x4）（x8+1/x8）（x16+1/x16）（x2-1）
(x-1/2)(2x+1)(2x^2+1/2)(4x^4+1/4)(16x^6+1/16)/(256x^16-1/256
(x+1)(x2+1)(x4+1)(x8+1)(x16+1)
解下列方程：（1）196x²-1=0 （2）4x²+12x+9=81 （3）x²-7x-1
x-1/7x+16-1/5(x-1/7x+16)+5=x+9
(x-1/2)(2x+1)(2x^2+1/2)(4x^4+1/4)(16x^8+1/16)÷(256x^16+1/256