2x-10.3x=15-搜答案-神马作文网

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是这样的：x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

0.5x=15x=30再答：0.2x=10x=50再答：4.5x=9x=2再问：能写内容

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583

x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

所谓的真理就是这样强迫人接受的

x^2+2x-15=(x+5)(x-3)=0所以x=-5或者x=3再问：是十字相乘吗再答：是呀

x(x^2-6x-9)-x(x^2-8x-15)+2x(3-x)=x^3-6x^2-9x-x^3+8x^2+15x+6x-2x^2=12x=36

(5X-15)-(2X+3)=X+12

(5X-15)-(2X+3)=X+123x-18=x+122x=30x=15

X(X^2-6X-9)-X(X^2-8X-15)+2X(3-X)=X^3-6X^2-9X-X^3+8X^2+15X+6X-2X^2=12x带入X=1/3原式=12*1/3=4

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=

x²-2x=5x²-2x-5=0x四次方+3x³-12x²-31x-15=x的4次方-2x³-5x²+5x³-10x²-

45x-120-8x-12=24x-24-445x-8x-24x=120+12-24-413x=104x=104÷13x=8

∵(x^4-4x^2+5x-15)/[(x^2+1)(x-2)]=[(x^4+x²-5x²-5)+(5x-10)]/[(x²+1)(x-2)]=[x²(x&su

x/x平方-x+2=2x/x+1

x/x(x-1)+2=2x/(x+1)1/(x-1)+2=2x/(x+1)x+1+2(x-1)(x+1)=2x(x-1)x+1+2x²-2-2x²-2x=0-x-1=0-x=1x=

A(x+5)(2x-3)<0-5<x<3/2并集是-5<x≤2所以B是m≤x≤2且m>-5交集是空集则m=3/2因为如果m<3/2,则交集不是空集而m>3/2

x+x=x+15

2x等于x+15x等于15

15-(4-5x)=2x+(35-3x)

15-4+5X=2X+35-3X11+5X-2X+3X=356X=35-116X=24X=4

X=8