30/x-30/(x+3)=40/60
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30/x-30/(x+3)=40/6030/x-30/(x+3)=40/6030/x-30/(x+3)=40/6030/x-30/(x+3)=40/60得9[(x+3)-x]=2x(x+3)即2x^2
30/x-30/(x+3)=40/60
30/x-30/(x+3)=40/60
30/x-30/(x+3)=40/60
30/x-30/(x+3)=40/60
得9[(x+3)-x]=2x(x+3)
即2x^2+6x-27=0
x=(-3±3√7)/2
60％x+25=40 x+30％x=52 19-120％x=7 4分之3x-5％x=17.5 x-10％x=18 （1-25％）x=36 2x+30％x=9.2
(16x-13)/(4x-3)-(20x-24)/(4x-5)=(32x-30)/(8x-7)-(40x-43)/(8x-9)求x
60x（x-4)=30x
3X+30+X+X-15=?
x+35=(x+3x)*30%
60(30x)=40x+20(30+x)+1200
40X=60(30-X)
(30-x)/(40-x)=3/5
3/5*(40-x)=30-x
x-(30-x)=(30-x)-x/3,怎么解
X/(x-30)=(x+40)/X解方程,
x-60%x-25%x=25%x-30
当2x=30x 3x=40x 4x=50x时 那么
x+(30-x)=60
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
x+3x-(9x+30x)=98
x-2/3x+x+2/7x=30
(x+30)*(x-18)=x*x