120=-2x+60x+800

120=-2x+60x+800 （60-x)(120-x)=800x是多少 60+3x=120+2x x=? x/(120-x)=(60-x)/60 x/（120-x）=x/60 x+2/3x=60 x-3/5x=120 4x+18x=1x+2/3x=60 x-3/5x=120 4x+18x=132! x+3分之2 x=60 x-5分之3x=120 4x+18x=132x+3分之2 x=60 x-5分之3x=120 4x+18x=132 x-x/4-120=x/2 x+2/3x=60 x-2/5x=120 4x+18x=132 120+60％x=x X+X-6+X-4+X/2=60 x*x-(x-2)*(x-5)=60 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 function f=myfun(X) f=0.34*X(1)+0.004*X(2)+0.14*X(3)+0.24*X(4)+0.08*X(5)+0.03*X(6)+6.05*X(7); goal=function f=myfun(X)f=0.34*X(1)+0.004*X(2)+0.14*X(3)+0.24*X(4)+0.08*X(5)+0.03*X(6)+6.05*X(7);goal=[1,1,1];weight=[1,1,1];X0=[190;150;120;60;800;1100;4]; (3x*x+3x*x+x*x)*2=120, (4/x-5)+(x-3)/(12-x)=(x-45)/(x^2-17x+60) x+3分之2x=60 x-5分之3x=120 解方程 x/50-3=x/60+2 （15+25/x）=120/10+x