若2x的m 4次方3n-2
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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]
x^3n=2x^6n+x^2n*x^10n=x^(2*3n)+x^(2n+10n)=(x^3n)^2+x^12n=(x^3n)^2+x^(4*3n)=(x^3n)^2+(x^3n)^4=2^2+2^4
=9*5³-4*5²=1025再问:一步一步
x^(6n)+y^(4n)=[x^(3n)]^2+[y^(2n)]^2=5×5+4×4=25+16=41
(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
原式=4x^6n-9x^2n=4(x^2n)^3-9x^2n=4×2^3-9×2=14
(x的2n次方)的立方+(y的n次方)的立方-x的2n次方×y的n次方×x的4n次方×y的2n次方=(x的3n次方)的平方+y的3n次方-x的6n次方xy的3n次方=(x的3n次方)的平方+y的3n次
x^2n=2,x^6n=8y^3n=3,y^6n=9(2x^3n)^2(y^2n)^3-3[(xy)^6]^n=4x^6ny^6n-3(xy)^6n=x^6ny^6n=8*9=72
x^m=2x^n=5x^(m+n)=x^m*x^n=2*5=10x^(m-n)=x^m/x^n=2/5x^(3m-2n)=x^(3m)/x^(2n)=(x^m)^3/(x^n)^2=2^3/5^2=8
你要化简的应该是以下表达式吧:[(x^n)·y]·{[x^(n-1)]·(y^2)}·{[x^(n-2)]·(y^3)}·……·{(x^3)·[y^(n-2)]}·{(x^2)·[y^(n-1)]}·
(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
(x的3n次方)的4次方=x的12n次方=(x的2n次方)的6次方=3^6=729
因为x的m-1次方+1>0,3x的2n次方-2x
x^(6n)+x^(4n)*x^(5n)=x^(6n)+x^(9n)=[x^(3n)]^2+[x^(3n)]^3=2^2+2^3=4+8=12
∵x的3n次方-x的2n次方+1=0∴x的3n次方=x的2n次方-1∴x的5n次方+x的n次方+2013=x的3n次方*x的2n次方+x的n次方+2013=(x的2n次方-1)*x的2n次方+x的n次
x^(2n)=2原式=4x^(6n)-9x^(2n)=4*[x^2n)]^3-9x^(2n)=4*2^3-9*2=14
x^3n=2那么x^6n+x^2n*x^10n=(x^3n)²+x^12n=4+(x^3n)^4=4+2^4=4+16=20
=3(x的n次方+2)(x的n次方-2)/x³(x的n次方+3)²×(x的n次方+3)/(x的n次方-2)×1/x(x的n次方+3)=3(x的n次方+2)/x³(x的n次