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2的2x加1次方,加4x次方,等于48,求x的值

2的2x+1次方+4的x次方=48 2x2的2x次方+2的2x次方=48 3x2的2x次方=48 2的2x次方=16 2的2x次方=2的4次方 2x=4 x=2

x=√2+1 x-1=√2 两边平方 x²-2x+1=2 x²-2x=1 所以4x^4+4x³-9x²-2x+1 =(4x^4-8x³)+(12x³-24x²)+(15x²-30x)+28x+1 =4x²(x²-2x)+12x(x²-2x)+15(x²-2x)+28x+1 =4x²+12x+15+28x+1 =...

2^(4x+1)-17(4^x)+8=0 (-8 + 2^(2 x)) (-1 + 2^(1 + 2 x))=0 x= -(1/2) x=3/2

3^x=2 2^(4x-1)=8 2^4x=16 2^x=2 2^x × 3^(x十2) =2×3^x×9 =18×2 =36

毕成来也 3x+y+2z=28 ① 5x-3y+z=7 ② ①-②*2,得 -7x+7y=14 7y=14+7x y=2+x 将y=2+x带入②,得 5x-6-3x+2=7 2x+z=13 z=13-2x 将y=2+x,z=13-2x代入x+y+z,得 x+2+x+13-2x=15 最佳可以给我了吧 主要就是用x来表示y和z

x²+4x-4=0 x²+4x=4 3x²+12x-5 =3(x²+4x)-5 =3·4-5 =12-5 =7

x²+4x-1=0 x²+4x=1 2x的四次方加8x的三次方减4x的平方减8x加1 =2x²(x²+4x)-4x²-8x+1 =2x²-4x²-8x+1 =-2x²-8x+1 =-2(x²+4x)+1 =-2+1 =-1

2×2的2x次方+2的2x次方=48 3×2的2x次方=48 2的2x次方=16 2的2x次方=2的4次方 2x=4 x=2

X^2+4X-1=0 2X^4+8X^3-4X^2-8X+1 =2X^4+8X^3-2X^2-2X^2-8X+2-1 =2X^2(X^2+4X-1)-2(X^2+4X-1)-1 =-1

(2x-3)²-(x+y)(x-y)-y² ,x²一4x一1=0 ,x²一4x=1 =4x^2-12x+9-x^2+y^2-y^2 =3x^2-12x+9 =3(x^2-4x)+9 =3+9 =12

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