若式子3x 5与1-2x-搜答案-拍题作业网

x=1.6

(1)x/2-3=-x/3+1x/2+x/3=1+35x/6=4x=24/5(2)x/2-3-x/3+1=0x/2-x/3=3-1x/6=2x=12(3)x/2-3+1=-x/3+1x/2+x/3=1

X5+X+1=X5-X4+X4-X3+X3-X2+X2+X+1=X4(X-1)+X3(X-1)+X2(X-1)+X2+X+1=X2(X-1)(X2+X+1)+(X2+X+1)=(X2+X+1)(X3-

x-2除以3=x+1除以2-2/3*2=X+1X=-7/3.

2(3x-5)=6-(1-x)6x-10=5+x6x-x=5+105x=15x=3

5x+1/2-3x=7x-7/315x+3-18x=14x-14-3x-14x=-14-3-17x=-17∴x=1

sn=(2-3x5^-1)+(4-3x5^-2)+…+(2n-3x5^-n)=（2+4+.+2n)-(3x5^-1+3x5^-2+.+3x5^-n)=（2^1+2^2+.+2^n）-(3x5^-1+3

如果式子x-3与1/2互为倒数,则：½(x-3)=1x-3=2x=5

我也在找答案!

(2x^2+3ax-y)-2(bx^2-3x+2y-1)=2x+3ax-y-2bx+6x-4y+2=(2-2b)x+(3a+6)x-5y+2与字母x的取值无关则2-2b=0,3a+6=0则b=1,a=

(x-1)/2=-(x-1)/3(x-1)/2+(x-1)/3=0(x-1)(1/2+1/3)=0(x-1)*(5/6)=0所以x-1=0x=1再问：我为啥等于5分之8

1/(2*3)+1/(3*4)+1/(4*5)+……+1/(98*99)+1/(99*100)=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+……+(1/98-1/99)+(1/99-1

因为互为相反数所以|2x+3|+(3x-1)/4=0当2x+3≥0,即x≥-3/2时,2x+3+(3x-1)/4=04(2x+3)+(3x-1)=08x+12+3x-1=011x+11=011x=-1

(2x-1/3+2)+(-1)=02x+5/3-1=02x=-2/3x=-1/3

-1

首先,y=x^5-3x+1的导函数y'=5x^4-3在1

二分之一再问：过程？再答：当x为何值时，式子1/2(4x-3)的值与式子x+1/3+1）=2再答：当x为何值时，式子1/2(4x-3)的值与式子x+1/3+1）=2再答：当x为何值时，式子1/2(4x

1*5+2*5+...+n*5=(1+2+...+n)*5=n(n+1)*5/2

当x>-3/2时,|2x+3|=2x+3由题意,∴2x+3+(3x-1)/4=0----->8x+12+3x-1=0----->11x=-11----->x=-1>-3/2所以x=-1成立；当x-8x

分两种情况1当x大于等于-3/2时2x+3=-（3x-1）/4可以得到x=-12当x小于-3/2时2x+3=（3x-1）/4可以得到x=-13/5