(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)(1)(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)(2)已知a^m=2,a^n=8,m,n为正整数,求a^m-n的值(1)(4x^n-1 y^n-2)^2÷(-x^n-2 y^n+1)
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(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)(1)(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)(2)已知a^m=2,a^n=8,m,n为正整数,求a^m-n的值(1)(4x^n-1 y^n-2)^2÷(-x^n-2 y^n+1)
(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)
(1)(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)
(2)已知a^m=2,a^n=8,m,n为正整数,求a^m-n的值
(1)(4x^n-1 y^n-2)^2÷(-x^n-2 y^n+1)
(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)(1)(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)(2)已知a^m=2,a^n=8,m,n为正整数,求a^m-n的值(1)(4x^n-1 y^n-2)^2÷(-x^n-2 y^n+1)
(1)(4x^n-1 y^n-2)÷(-x^n-2 y^n+1)
=-4xy^-3
=-4a/y^3
(2)已知a^m=2, a^n=8,m,n为正整数,
a^m-n
=a^m/a^n
=2/8
=1/4
(x^n* y)*(x^n-1* y^2)*(x^n-2*y^3)*……(x^2*y^n-1)*(x*y^n)=x^n*x^n-1*……x*y^n*y^n-1*……y=x^(n+n-1……+1)*y(n+n-1……+1)=x^a*y^a
(1)(4x^n-1 y^n-2)^2÷(-x^n-2 y^n+1)=-16x^(2n-2-n+2)y^(2n-4-n-1)=-16x^n y^(n-5)
(2)a^m-n=2/8=1/4
(4x^n-1 y^n-2)÷(-x^n-2 y^n+1) =[﹙4xˆn/4x﹚×﹙yˆn/y²﹚]÷[﹙-xˆn/ xˆ2﹚×﹙yˆn×y﹚] =[﹙4xˆn/4x﹚×﹙yˆn/y²﹚]×﹙ xˆ2/[﹙-xˆn﹚×﹙...
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(4x^n-1 y^n-2)÷(-x^n-2 y^n+1) =[﹙4xˆn/4x﹚×﹙yˆn/y²﹚]÷[﹙-xˆn/ xˆ2﹚×﹙yˆn×y﹚] =[﹙4xˆn/4x﹚×﹙yˆn/y²﹚]×﹙ xˆ2/[﹙-xˆn﹚×﹙yˆn×y﹚] =-1/y³ 已知a^m=2,a^n=8,m,n为正整数,求a^m-n的值 =aˆm/aˆn =2/8 =¼
a^m-n
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[4x^(n-2)*xy^(n-2)]/[-x^(n-2)y^(n-2)*y^3] 上下同时约去x^(n-2)y^(n-2) 得到 4x/(-y^3) a^n=8=2^3=(a^m)^3 所以 a^n=a^(3m) n=3m 所以a^(m-n)=a^(m-3m)=a^(-2m)=(a^m)^(-2)=2^(-2)=1/4