13.2x十9x=33.3

13.2x十9x=33.3 3x十9x十X=26. 427十7x二387十9x=? 1十3十5十7十9十11十、、、、、、十99=()=()x() 8×十9x十10x十16x x十24十x=34 解方程x十1.25x=9 ,x是多少 16+0.2x=0.25x十9求x! X.(X十1)x(X十2)x(x十3) =360 x十5十x十6…=1000 18=(?)十(?)x(?) 5x十2x=42 15十2x一3=48 2x十3x十17=37 6x一3x=6÷5 9x一2x=15x十2x=4215十2x一3=482x十3x十17=376x一3x=6÷59x一2x=1.4十0.077(2x一6)=15.4 7十x:9十x=2:3求x要具体过程 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 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