x÷2+2x=16÷0.40.5x+2x=40(0.5+2)x=402.5x=40x=40÷2.5x=16
x÷2+2x=16÷0.42.5x=40x=40/2.5x=16
x/(2+2x) =16/0.4 ?是这样么?40(2+2x)=x所以,x = - 79/80
x÷2+2x=16÷0.40.5x+2x=402.5x=40x=16
x=16