√x十√x+5十2√xチ0ナ5+5x=25-2x
已知1十x十x^2 十x^3=0,求x十x^2十x^3十x^4+x^5十x^6+x^7十x^8的值
x十5十x十6…=1000
4x²-10x+√2x²-5x+2=17 四x的平方减去十x加上根号下二x的平方减去五x加上二等于十
x(x-14)二0*x平方十|2x十27=0,x平方=x+56,x(5x+4)=5x+4,4x平方-45=3|x,-3x
(x^3十3x^2-5x十6)-(2x^2-5x十1)-(x^3十x^2-2)
X.(X十1)x(X十2)x(x十3) =360
2x十5=17,8x-3x=6.5,6x十3x=36,
3x十7x十5x一7x=17十18
(2X一)(X十3)=3X十5
(7一2X十x平方)一(5十3X一2x平方)
5x十2x=42 15十2x一3=48 2x十3x十17=37 6x一3x=6÷5 9x一2x=1
4(x十5)+x=80