解方程(2x-5)³=-64
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/08 01:43:08
设a=√x,b=√(x+5)则x=a²,x+5=b²∴a²+5=b²,即b²-a²=5.故25-2x=5×5-2x=5(b²-a&
2x+3x+5x=3210x=32x=3.2
9x^2+x=0把x提出来x(9x+1)=0x=0或9x+1=0所以x=0或-1/9
x(2x-4)+3x(x-1)=5x(x-3)+82x²-4x+3x²-3x=5x²-15x+88x=8x=1
x1=1/3(10-7(2/(1357-9√[22717]))^(1/3)-(1/2(1357-9√[22717]))^(1/3));x2=10/3+1/6(1+i√[3])(1/2(1357-9√[
3.5-5x=25x=3.5-25x=1.5x=0.3
5+3x=17.6-x3x+x=17.6-54x=12.6x=12.6/4x=3.15
移项5X-2X+X=7(5-2+1)X=74X=7X=7÷4X=1又4分之3
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)
-1
5x+2=-85x=-8-25x=-10x=-2,补充:你好!x=-2,经代入验算,答案正确的!望采纳,谢谢!
5x+2x+x=5.68x=5.6x=5.6÷8x=0.7
2(x-3)(x+5)=x^2+(x+2)(x-2)+(x+7)2(x^2+2x-15)=x^2+x^2-4+x+72x^2+4x-30=2x^2+x+33x=33x=11
两边*22x-10=xx-10=0x=10
2X+5=212X=21--52X=16X=8
5x+6x-9=2x11x-2x=99x=9x=1
(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
设X为正数则:(X+2)-(3X+5)=1+X解得X=-4/3设X为负数则:(-X+2)-(-3X+5)=1+(-X)解得X=4/3
解方程:(x-2)(x^2-6x-9)=x(x-5)(x-3)将方程展开:X^3-6x^2-9x-2x^2+12x+18=x^3-8x^2+15x合并同类项得:12x=18则x=18/12=3/2