解方程
(3/5)/[(x/36+x/45)*(1+1/5)]+(2/5)/[(x/36+x/45)*(1+1/5)-50]=18
(1+1/5){(3/5)/[(x/36+x/45)+((2/5)/[(x/36+x/45)}=68
{(3/5)/(x/36+x/45)+((2/5)/[(x/36+x/45)}=170/3
(x/36+x/45)(3/5+2/5)=170/3
x/36+x/45=170/3
x=1133又1/3400
解方程
(3/5)/[(x/36+x/45)*(1+1/5)]+(2/5)/[(x/36+x/45)*(1+1/5)-50]=18
(1+1/5){(3/5)/[(x/36+x/45)+((2/5)/[(x/36+x/45)}=68
{(3/5)/(x/36+x/45)+((2/5)/[(x/36+x/45)}=170/3
(x/36+x/45)(3/5+2/5)=170/3
x/36+x/45=170/3
x=1133又1/3400