作业帮18x减57,6=32.5
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/09 05:37:05
3x-18=13.23x=13.2+18x=10.41.5x-x=60.5x=6x=6/0.5=124x+1.2x=265.2x=26x=5
1,（1）将（x+3/x-1）设为a（2）得a²-5a+6=0（3）因式分解（a-2）（a-3）=0（4）a1=2a2=32,化简得x³-4x²+18=0
symsxa=x^4+3*x^3+9*x-18b=x^5-4*x^3-18*x+7c=x^7+6*x^5+9*x^3-5*x^2-2d=x^9-8*x^7+6*x^5-4*x^4+6*x^2+3e=c
6x+1.5x=97.5x=9x=9/7.5X=1.218-0.2X=80.2X=18-8X=10/0.2X=50X-0.25=0.8X=0.8+0.25X=1.05
x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊
6x=54+3x6x-3x=54x=54÷3x=18
9(x-18)=6x9x-9*18=6x左右互换9x-6x=9*183x=9*18x=3*18x=54
6/x=x-56＝x(x-5)x^2-5-6=0(x-6)(x+1)=0x1=6x2=-1再问：^是什么再答：^2是平方
1/x（x+3)+1/（x+3)(x+6)+1/（x+6)(x+9）=3/2（x+9)（1/3）×[3/x（x+3)+3/（x+3)(x+6）+3/（x+6）（x+9)]=3/2（x+9）（1/3)[
原式=x^4-8x^3+13x^2+10+2x(x^2-8x+13)+(x^2-8x+13)=x^2(x^2-8x+13)+10=10分组代入后得10
x=-12x=-1x=2/3
设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=
1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=1/3[1/x-1/(x+3)]+[1/(x+3)-1/(x+6)]+.+[1/(x+15)-1/(x+18)
1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=[1/x-1/(x+3)+1/(x+3)-1/(x+6)+1(x+6)-1/(x+9)]/3=[1/x-1/(x+9)]/3=3/
36/(1.25x)-(18×1.25)/(1.25x)=6(36-18×1.25)/(1.25x)=613.5/(1.25x)=61.25x×6=13.57.5x=13.5x=1.8
x/x-3减x+6/x^2-3x加3/x=[x*x-(x+6)+3(x-3)]/x(x-3)=(x^2-x-6+3x-9)/x(x-3)=(x^2+2x-15)/x(x-3)=(x+5)(x-3)/x
x^6+x^5(-1-3)+x^4(-4+3+1)+x^3(7+12-1-2)+x^2(-21-4+2)+x(7+8)-14+6x^2-15x+18=0x^6-4x^5+16x^3-17x^2+4=0
你所给的公式太复杂,最好在word中排版以图片发来.或多加点括号,这样才能让人看懂.
6x-3x=183x=18x=61.5x+18=3x1.5x=18x=12
X=4原式=(X-1)/(X-2)-(X-2)/(X-3)=(X-4)/(X-5)-(X-5)/(X-6)左边通分=[X^2-4X+3-X^2+4X-4]/[(X-2)(X-3)]=-1/[(X-2)