(0.2/x+4)-(0.5/x-3)=1.4 5（x+4）-2(x-3)=1.45x+20-2x+6=1.43x=1.4-263x=-24.6x=-8.2(3/2x-1)-(6/10x+1)=(4/2x+1)-1 两边乘124（2x-1）-2(10x+1)=3(2x+1)-128x-4-20x-2=6x+3-12-12x-6=6x-96x+12x=9-618x=3x=1/6如还...