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10/9
(x+2)²=-729x+2=-9x=-11
x的立方=-729,则x=-9
=lg243/lg4-lg729/lg8=5lg3/2lg2-6lg3/3lg2=5lg3/2lg2-4lg3/2lg2=lg3/lg4=log4(3)原式=lg12/lg4-lg6/lg2=(2lg2+lg3)/2lg2-(lg3+lg2
(x²+8)的3次方=729x²+8=9;x²=1;x=±1;很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,
(1-2x)^3+729=0(1-2x)^3=-729(1-2x)^3=-9^3所以1-2x=-92x=10x=5
1(根号361/16)=4.752(立方根729)-2=-11
729x的3次方+3次根号负8=根号625729x³-2=25729x³=279x=3x=1/3
(x/2)的三次方+729=0(x/2)³=-729x/2=-9x=-18
1-1/3-1/9-1/27-1/81-1/243-1/729=1-(1/3+1/9+1/27+1/81+1/243+1/729)=1-{(1/3)*[1-(1/3)^6]/[1-(1/3)]=1-[(728/729)/2]=1-(364/
(x/2)的立方+729=0(x/2)的立方=-729(x/2)的立方=(-9)的立方x/2=-9x=-18
729x的三次方=7根号下81+1729x的三次方=7x9+1729x的三次方=64x³=64/729x³=(4/9)³x=4/9
(2x+1)³=-729/642x+1=-9/42x=-13/4x=-13/8再问:能否带入式子计算一遍再答:x=-13/8代入得:(2x+1)³=(-9/4)³=-729/64
1-2/3-2/9-2/27-2/81-2/243-2/729=1-2/3-2/9-2/27-2/81-2/243-2/729-1/729+1/729=1-2/3-2/9-2/27-2/81-2/243-3/729+1/729=1-2/3-
由二项式定理得(1+2)n=1+2Cn1+22Cn2+…+2nCnn,所以3n=729,可知n=6,所以Cn0+Cn1+Cn2+…+Cnn=2n=26=64∴Cn1+Cn2+Cn3+…+Cnn=64-1=63.故选A.
-93/4
27
由题意得,3n的末尾数字的循环周期为4∴当n=2010时.有2010÷4=502…2∴32010的末位数字与32=9的末尾数字相同是9.故选B
原式=(3-1)(3+1)(32+1)(34+1)(38+1)(316+1)(332+1)+2=(32-1)(32+1)(34+1)(38+1)(316+1)(332+1)+2=(34-1)(34+1)(38+1)(316+1)(332+1
个位数字规律:3,9,7,1循环2013=4*503+1∴它的个位数是第一项的个位数3