x+13%-28%=3.4===

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x+13%-28%=3.4===x+13%-28%=3.4===x+13%-28%=3.4===x+13%-28%=3.4x-0.15=3.4x=0.15+3.4=3.55x-15%=3.4x-0.1

x+13%-28%=3.4===
x+13%-28%=3.4
=
=
=

x+13%-28%=3.4===
x+13%-28%=3.4
x-0.15=3.4
x=0.15+3.4
= 3.55

x-15%=3.4
x-0.15=3.4
x=3.55

X+13%=3.4+28%
x=3.55

X+13%-28%=3.4 两边同乘以100得 100X+13-28=340 100X=340+28-13 X=3.55

x+13%x-28%x=3.4 X+13%X-28%X=3. x 13%-28%x=3.4 x+13%x-28%x=3.4 的过程（X+X)+(X-X)+(X*X)+(X/X)=100 X+13%x-28%x=3.4 120-25%x=100 怎莫算怎样计算百分数的方程120-25%x=100x+13%x-28%x=3.4(1-40%)x=720x-95%x=155 x*x*x*x*x=80000? x+0.13x-0.28x=3.4 4x+9x=13x 13x-6.8x+x=46. 13x-15x+x=-3 x*x-10*x=13急 x+3.4x=28.6 x+3.4x=28.6 x+40%x=28 x+13%x-28%x=3.4 ==== 2*x*x+2.5x=13 x=?