解方程(x-1)²
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(x+1)(x+3)+4x=-13x方+4x+3+4x+13=0x方+8x+16=0(x+4)方=0x1=x2=-4
(x+1)/x²-3=1/xx+1-3x²=x3x²=1x²=1/3x=±(√3)/3再问:1/x^2-1+2/x+1=3/x-1再答:������������
原分式方程化为:2x+1x(x+1)=56(x+1),方程的两边同乘6x(x+1),得6(2x+1)=5x,解得x=-67.检验:把x=-67代入6x(x+1)≠0,即x=-67是原分式方程的解.则原
x方-2x=2x+1x²-4x=1x²-4x+4=5[x-2]²=5x-2=±√5x=2±√5再问:为啥+4再答:加4后,这个x²-4x+4变为完全平方式。正好
两边乘(x+3)(x-2)6x+18=x²-2x-x²-x+66x+18=-3x+69x=-12x=-4/3经检验,x=-4/3是方程的解
(1)去分母得:x2-4x+x2-1=2x(x-1),整理得:2x=-1,解得:x=-12,经检验是分式方程的解;(2)去分母得:5(x-1)-(x+3)=0,解得:x=2,经检验x=2是分式方程的解
X-X+1/4X=561/4X=56X=56÷1/4X=224
x-1%x=19.80.99x=19.8x=19.8/0.99x=20x-40%x=150.6x=15x=15/0.6x=25x+25%x=2.51.25x=2.5x=2.5/1.25x=250%x+
x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)
再答:望给予好评。
1.5X-X=1(1.5-1)X=10.5X=1X=1÷0.5X=2
令x2+2x-8=y,方程化为1y+9x+1y-1y−15x=0,即9x+2yy(y+9x)=1y−15x,解得:y=9x或y=-5x,当y=9x时,x2+2x-8=9x,解得:x1=8,x2=-1;
转换一下x^2=3X-2x≠0X≠2/3X^2-3X+2=0(x-2)(X-1)=0x=2X=1
方程两边同乘x(x+1)(x+2)(x+3)(x+4),得(x+2)(x+3)(x+4)+x(x+3)(x+4)+x(x+1)(x+4)+x(x+1)(x+2)=421x(x+1)(x+2)(x+3)
解x²-2x=2x+1x²-2x-2x=1x²-4x+4=5(x-2)²=5∴x-2=√5或x-2=-√5∴x=2+√5或x=2-√5
x(x+1)=42x^2+x-42=0(x-7)(x+6)=0所以x-7=0或x+6=0即x=7,或x=-6
方程变形得:x+2−1x+2-x+3−1x+3=x+6−1x+6-x+7−1x+7,即1-1x+2-1+1x+3=1-1x+6-1+1x+7,整理得:1x+3-1x+2=1x+7-1x+6,即x+2−
(x+1)(x-3)=2x+5x²-2x-3=2x+5x²-4x=8x²-4x+4=8+4(x-2)²=12x-2=±2√3x=2-2√3,x=2+2√3
x/x-1+1/x=1x²+x-1=x²-22x=1x=1/2
x²+3x-1=x-2x^2+2x+1=0(x+1)^2=0x=-1