5 7X-1 3=2 3
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/25 20:02:24
1.514:35=57:X514X=57×35X=1995/5142.23:X=12:1412X=14×23X=322÷12X=161/63.X:15=13:5656X=13×15X=195/564.
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583
x²-8x+13=0(x^4-6x^3-2x^2+18x+23)/(x^2-8x+15)=[x^2(x^2-8x+13)+2x^3-15x^2+18x+23]/(x^2-8x+15)=[2x
x²-8x+13=0(x^4-6x^3-2x^2+18x+23)/(x^2-8x+15)=[x^2(x^2-8x+13)+2x^3-15x^2+18x+23]/(x^2-8x+15)=[2x
1:23X-40%X=2.423X-0.4X=2.422.6X=2.4X=1.2/11.3X=12/1132:120:X=13:179里面和里面相乘,外面和外面相乘:13X=120×17913X=21
6x^3+7x^2-13x+11=6x^3+3x^2-15x+4x^2+2x-10+21=3x(2x*x+x-5)+2(2x*x+x-5)+21=3x*0+2*0+21=21
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+X)+(X-X)+(X*X)+(X/X)=1002X+0+X*X+1=1002X+X*X=99X(X+2)=99X=9再问:请问X(X+2)=99解为什么就等于9了呢没看懂再答:换成算术法你就明
是的,含有未知数的等式叫方程.再问:可是陕西师范大学练习册答案说不是再答:怎么可能呢,而且它是有无数解。
每个绝对值里都是正数所以原式=x+1+x+3+x+5+……+x+13-x-2-x-4-x-6-……-x-12=x-1*6+13=x+7=π/2+7
X+13%X-28%X=3.4x+0.13x-0.28x=3.41.13x-0.28x=3.40.85x=3.4x=4
13x-6.3x+x=46.86.7x+x=46.87.7x=46.8x=468/77
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=
(X(13-X)(X+(13-X)))/(X+1)=42得分母是X^2(13-X)+(13-X)X分子是(X+1)再得分母X(13-X)(X+1)分子分母抵消的(X+1)X=42得X=6
x(13X-30)/(12X+30)=23/2727×(13x-30)=23×(12x+30)351x-810=276x+690351x-276x=690+81075x=1500x=20
图片回答 请追问下再问:哦再答:
23X-40%X=2.4(23-0.4)x=2.422.6x=2.4x=2.4/22.6x=12/113120:X=13:17913x=179*120x=179*120/13x=21480/13
x-0.15x=3.40.85x=3.4x=4