25000*(1-20%)X+25000=26000
怎么求的啊?
25000*(1-20%)X+25000=26000
怎么求的啊?
25000x(1-20%)X+25000=26000
25000x80%X+25000=26000
25000x80%X+25000x1=26000
25000x(1+80%)X=26000
25000x1.8X=26000
25000x1.8X\25000=26000\25000
1.8X=1.04
1.8X\1.8=1.04\1.8
X=0.577的循环
25000*(1-20%)X是减去收税后的所生的利息
再加上25000就等于本息和26000
x=(26000-25000)/(25000*0.8)
=1000/20000
=1/20