诺X为正整数,且3X的2N次方等于5求3N的3N次方的2N次方
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9(x的3n次方)的2次方-13(x的2次方)的2n次方=9(x的2n次方)³-13(x的2n次方)²=9x3³-13x3²=243-117=126如果本题有什
若n为正整数,且x的3n次方=7,则2[x的2n次方*4的n次方(-x)的2n次方]的立方/(-2x)的6n次方=2[x^2n*2^2n*x^2n]的立方/(2^6x^6n)=2[2^2n*x^4n]
已知n为正整数,且x的2n次方=3,那么:9(x的3n次方)的平方=9*(x的6n次幂)=9*(x的2n次幂)³=9*3³=9*27=243
(3x的3n次方)的2次方-4(x的2次方)的2n次方=9x的6n次方-4x的4n次方=9(x的2n次方)的3次方-4(x的2n次方)的2次方x的2n次方=7=9*7³-4*7²=
(x的3n次方)平方-4(x平方)的2n次方=(x的2n次方)³-4(x的2n次方)²=7³-4×7²=147再问:再问:第五题
(X的n次方)²=9,即:X的2n次方=9(1/3X的3n次方)²-3(X²)的2n次方=(1/3)²(X的2n次方)³-3(X的2n次方)²
3x的6n次方+2x的4n次方乘x的5n次方=3x^6n+2x^9n(1)把x的3n次方=2代入(1)=3(x^3n)^2+2(x^3n)^3=3*2^2+2*2^3=3*4+2*8=12+16=28
x等于3n等于1结果自己算吧
原式=2^3×(x^2n)^3-7(x^2n)^2=8×7^3-7×7^2=(8-1)×7^3=7^4=2401
X^2N=4原式=9X^6N-13X^4N=9(X^2N)^3-13(X^2N)^2=9×4^3-13×4^2=368
(x^n)^2=9x^(2n)=9所以:(x^3n)^2-3(x^2)^2n=(x^2n)^3-3(x^2n)^2=9^3-3*9^2=486
即x的2n次方=8所以原式=1/4*x的6n次方-3x的4n次方=1/4*(x的2n次方)³-3*(x的2n次方)²=1/4*512-3*64=-64
x^2n=3所以(x^3n)^2=x^6n=(x^2n)^3=3^3=27
(x的3n次方)平方-4(x平方)的2n次方=(x的2n次方)³-4(x的2n次方)²=7³-4×7²=147
(2x的3n次方)²+(-3x的2n次方)³=4[x的2n次方]³-27[x的2n次方]³=-23[x的2n次方]³=-23×6³=-496
由题意:x^2n=3得(x^2n)^3=3^3得x^6n=27(3x^3n)^2=9x^6n=9*27=243
原式=9x^6n-45×5²=9(x^2n)³-1125=9×5³-1125=0
x^(2n)=77(x^(3n))^2-3(x^2)^(2n)=7(x^(6n))-3(x^(4n))=7((x^(2n))^3)-3((x^(2n))^2)=7(7^3)-3(7^2)=2254
(x的3n的次方)的2次方-4(x的2次方)的2n次方=x的6n次方-4x的4n次方=(x的2n次方)的3次方-4(x的2n次方)2次方=4^3-4*4^2=0