3.2x=170%x十22.5

3.2x=170%x十22.5 3.2X十0.8X=28.8 x十24十x=34 X.(X十1)x(X十2)x(x十3) =360 x十5十x十6…=1000 18=(?)十(?)x(?) x十x十x十y十y=54?x十x十y十y=46?x,y各等于多少? 3十x十x=5x, (x+12)X(x十12)=xXx十360 3x十9x十X=26. x的平方十x(x十4)=30, 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 3x十7x十5x一7x=17十18 2x十8十3x十8十4x十8=?请算出这道题目求士寸佰了⑥ 2(x十3)=3(0.5x十10) 5X十(X十1)=19怎么解, x^2十5x十10700=12000 4X十3(X十1)=31