2(x+3.8)=10

(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2=x^2+10x-24+x^2+15x+56-x^2+5x+50=x^2+30x+82=4+60+82=146其实,不化简,直接代入=14*0+9*10+7*8

解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=(x/2)*(2/x(x+2))+(2/(x+2)(x+4))+

x^2+10x()=(x+)^2那括号是什么东西第一个括号是25第二个是5

x^2-10x=2-xx²-10x=2-xx²-9x-2=0a=1b=-9c=-2代入求根公式得x=[9±√(81+8)]/2=(9±√89)/2所以x1=(9±+√89)/2x2=(9-√89)/2

X+X+X+(X-1)+(X-2)+(X-3)+(X-4)=10(X-3)+(X-4)7x-10=11x-34-4x=-24x=6

2x×x=10,求x2*X*X=10X*X=5X=+-√5

x+2x×10=10x+2x+36x+2x×10=10x+2x+36x+20x=12x+3621x-12x=369x=36x=4x+2x×10=10x+2x+36x+20x=12x+3621x-12x=369x=36x=36÷9x=4x=4

x+2x+（x+10）=90,x=?x+2x+(x+10)=904x=80x=203x+x+10=904x=80x=20X=2020

10x-6.2x-2x=36x=?10二十简单

x-10+X+20+X/2+2X=370x-10+X+20+X/2+2X=3704.5x+10=3704.5x=360x=80

x+10+x-20+2x+x/2=370x+10+x-20+2x+x/2=370x+x+2x+0.5x=370+20-104.5x=380x=380/4.5x=760/9x+10+x-20+2x+x/2=3704X+x/2-10=3704x

填空:(x+5)(x+?)=x^2+7x+1010÷5=2所以(x+5)(x+2)=x^2+7x+10(x+5)(x+2)=x^2+7x+10不懂可追问，有帮助请采纳，谢谢！(x+5)(x+2)=x^2+7x+10，是因为10÷5=2，不懂

1)1+x+x^2=0,求1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^10的值2)1+x+x^2=0,求1+x+x^2+x^3+……+x^20的值（1）原式=(1+x+x^2)+x^3(1+x+x^2)+x^6(1+

1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11=17.7这个方程怎么样求解?这是等比数列,可以看做F(X)=(X)^(N-1)求和公式S(N)=1*（1-X^N）/(1-X)=17.7(n=11)

10x-x^2=600x=?10x-x^2=600x=?x²-10x+600=0x²-10x+25+575=0(x-5)²=-575平方大于等于0‘所以不会等于-575方程无解

100(X-2)+10X+2X=100*2X+10X+X-2-495100(X-2)+10X+2X=100*2X+10X+X-2-495100X-200+10X+2X=200X+10X+X-2-495100X+10X+2X-200X-10X

100×2x+10x+3x+216=100×3x+10×2x+x100×2x+10x+3x+216=100×3x+10×2x+x200x+10x+3x+216=300x+20x+x216=321x-213x108x=216x=2

(x+2)(x^2+5x-10)-(x+2)^2(x-1),其中x=1.5(x+2)(x^2+5x-10)-(x+2)^2(x-1)＝(x+2)[(x^2+5x-10)-(x+2)(x-1)]＝(x+2)[(x^2+5x-10)-(x^2+

(x+2)(x^2+5x-10)-(x+2)^2(x-1),其中x=1.5,题目是这个吗?。。。。。。路过

15X(4X-8)-5X(2X+10)=6X(5X-20)15X(4X-8)-5X(2X+10)=6X(5X-20)60x-120-10x-50=30x-12020x=50x=2.5