2x-5=1.6解方程
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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√[
x-0.2x=180.8x=18x=18÷0.8x=22.5
3.5-5x=25x=3.5-25x=1.5x=0.3
移项5X-2X+X=7(5-2+1)X=74X=7X=7÷4X=1又4分之3
1.6x-2/5x+6=10.81.6x-0.4x=10.8-61.6x-0.4x=4.8(1.6-0.4)x=4.81.2x=4.8x=4.8÷1.2x=4(希望会被选为最佳答案)
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
2(x-1.6)=8.4两边同时÷2;x-1.6=4.2x=4.2+1.6x=5.8
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