搜搜考试网2x-0.7×5=2.1 解方程 6+0.7X＝83解方程
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/26 05:29:46
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√[
2.1X+7.9X=6.910x=6.9x=6.9/10x=0.695X+0.8乘2=7.35x+1.6=7.35x=7.3-1.65x=5.7x=5.7/5x=1.14
3.5-5x=25x=3.5-25x=1.5x=0.3
2-x+5/6=x-x-1/3两边乘612-x-5=6x-2x+27-x=4x+25x=5x=10.1-0.2x/0.03-1=0.7-x/0.4两边乘1.240-80x-1.2=5.1-3x77x=
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