x=0.8894*x计算
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(3x+2)/5-(x-6)=x/33(3x+2)-15(x-6)=5x9x+6-15x+90-5x=0-11x+96=0-11x=-96x=96/11
x-2/5x+120=3/4x0.6x+120=0.75x0.15x=120x=800
x*2x=4x4x*3x=11x11x*4x=26x26x*5x=57x57x*6x=120x120x*7x=247x247x*8x=502x502x*9x=1013x=3039x=3
原式=x2+2x+4(x+2)2÷(x−2)(x2+2x+4)3(x+2)÷1(x+2)(x−2)=x2+2x+4(x+2)2•3(x+2)(x−2)(x2+2x+4)•(x+2)(x-2)=3.
x2x−5+255−x=x2x−5-25x−5=x2−25x−5=(x+5)(x−5)x−5=x+5,故答案为:x+5.
乘号不能省略,
X=0.8X+2500X-0.8X=25000.2x=2500x=12500
10%x=x-1.8解1.8=x-10%xx-10%x=1.8可以省略90%x=1.8x=1.8/90%可以省略x=2注意写解等号对齐熟练后中间一些步骤可以省
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)
移项,得,x²-5x=0提取公因式,得,x(x-5)=0所以x=0或者x=5
[x^2+8x+16]=32[x+4]^2=32x+4=±4√2x=-4±4√2
x²/(x-5)+25/(5-x)=x²/(x-5)-25/(x-5)=(x²-25)/(x-5)=(x+5)(x-5)/(x-5)=x+51/x-1/(x-1)=[(x
(1+4)X等于205X等于20X等于20除以5X等于4再答:你初一吧!
2x*(-x)4次方=2x^5
x^2-x=x(x-1)因式分解
X-7=0.99x0.01x=7x=700
2x*4x-3x=8x平方-3x
x(x+1)(x+2)(x+3)=360[x(x+3)][(x+1)(x+2)]-360=0[(x^2+3x)][(x^2+3x)+2]-360=0(x^2+3x)^2+2(x^2+3x)-360=0
X^2+X-7=0X1=根29-1X2=-1-根29X^2+X-2=0X1=-2X2=19-6X+X^2+X=9X^2-5X=0X(X-5)=0X1=0X2=5
原式=(x−2x+2-xx+2)•x+2x−1=−2x+2•x+2x−1=−2x−1.