(1+30)x*90%+(200-x)*(1+20%)*90%=27.7+200 帮我解下这方程.

（x-2)/30+(x-3)/45+x/90=1 (1+30%)X×80%=200+X 计算1/x(x+1).+1/(x+199)(x+200) 30x+90＝x x(30-x)=200 x/x+(1-x)/x-1/x x/6+x/12+x/20+x/30=1 X(X-1)=90 求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-1 x^3+x-30(分解因式);x^12-y^12;x^15+x^14+x^13.x^2+x+1 计算：1/X(X+2)+1/(X+2)(X+4)+...+1/(X+28)(X+30) 1/x(x+3)+1/(x+3)(x+6)+---+1/(x+27)(x+30） 1/90x+1/30(x-3)+1/45(x-2)=2/3等方程求解1、1/90x+1/30(x-3)+1/45(x-2)=2/3 x=?2、1/3x+1/3x+21+(x-1/3x)*1/5-3=x x=?3、方程组：x+y=66 ①﹛1/2x+3/7y=30 ②x=?y=?4、250/x-300/2x=10 x=?5、2x-(52-2x)=(52-x)/3 x=?6、5(x+4)*1/3-30=x x=?一定 *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 1.90%x（1+20%）+90%x（1+15%）*（2200-x）=2200+1312.12%x+14x%（30-x）=43.90%x*24（1+20%x）=x 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 解方程每一步我都要哦!(1+30%)*90%X+(1+20%)*90%X(200-X)90%=200+27.7 求几道解方程数学题60%x+25=40 x+30%x=52 19-120%x=7 x-10%x=18 (1-25%)x=362x+30%x=9.260%x+90=102 x-20%=5.2 50%x+3x=28 9.1-14%x=0.7