25(1 2x)的平方=16(x-6)的平方(分解因式法)
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直接开平方法4(x-3)=±5(x+4)∴4x-12=5x+20或4x-12=-5x-20∴x=-32或x=-8/9
/>(15-2x-x²)/(x²+x-12)=-(x²+2x-15)/(x²+x-12)=-(x+5)(x-3)/[(x+4)(x-3)]=-(x+5)/(x-
x²-7x+12=(x-3)(x-4)x²+3x-40=(x+8)(x-5)
令x²+x=t原方程化为:t(t-6)=16即:t²-6t-16=0(t+2)(t-8)=0t1=-2,t2=8(1)x²+x=-2,即:x²+x+2=0,无解
(xx-8x+16)/(xx-4x+4)+[1+2/(x-2)][1+2/(x-2)]=2x/(x-2)(x-4)^2/(x-2)^2+[1+2/(x-2)]^2=2x/(x-2)[1-2/(x-2)
25x²+40x(y-x)+16(x-y)²25x²-40x(x-y)+16(x-y)²=[5x-4(x-y)]²=(x+4y)²
16x^2=81x^2=81/16x=±9/4(x-2)^2-25=0(x-2)^2=25x-2=5x-2=-5x=7或x=-3(4x+1)^2-1=63/81(4x+1)^2=16/94x+1=4/
因为X的平方+4X-2=0所以X的平方+4X=2那么3X的平方+12X+2000=3*(X的平方+4X)+2000=3*2+2000=2006
两边平方得12^2-(20-x)^2=16^2-x^2整理得40x=12^2-16^2-20^2x=-32/5经检验符合原方程再问:真的??~再答:嗯再问:下面那人说了答案再答:我刚才算错了,已经改过
16(X-2)的平方=25(X+2)4(x-2)=±5(x+2)4x-8=5x+10或4x-8=-5x-10-x=18或9x=-2x1=-18x2=-2/9
设x²-2x=y则原方程可化为y-12/y=1∴y²-y-12=0∴(y-4)(y+3)=0∴y=4y=-3∴x²-2x=4x²-2x=-3∴x=1+√5x=1
3x²+2x²-3x-(-x+5x²)=3x²+2x²-3x+x-5x²=-2x其中x=314时,-2x=-2*314=-6285xy-8x
(1)x=6或x=-6(2)x=7或者x=-7(3)x=5/2或者x=-5/2
x²+3x=12x²+3x-12=0代入求根公式得x=[-3±√(9+48)]/2x1=(-3+√57)/2x2=(-3-√57)/2再问:лл�����ü�ʱ������x���
x的平方-4x+3=0(x-3)(x-1)=0x1=1,x2=3x的平方-2x-1=0△=4+4=8∴x=(2±2√2)/2x1=1-√2,x2=1+√22x的平方+3x+1=0(2x+1)(x+1)
因为b²+c²=x²+16,(1)d²+b²=x²+25,(2)a²+c²=x²+9,(3)将(2)(3)相加
(X-7)(X+2)
[4(2x-1)]²-[5(x-2)]²=0(8x-4)²-(5x-10)²=0(8x-4+5x-10)(8x-4-5x+10)=0(13x-14)(3x+6)
x(x+4)/(x+4)²=1x/(x+4)=1x=x+40x=4无解
x^2+12x+25=0x=(-12±(144-100)^0.5)/2=-6±(11)^0.5