3.2比1.6=x比5x=3.2*5/1.6x=10 x比1.4= 2比3.5x=1.4*2/3.5x=0.8 1/100比1/2=2/5比x x=1/2*2/5*100x=2036/x=1.8/5x=36*5/1.8x=1000.4/25=x/75 x=0.4*75/25x=1.2如有帮助,请采纳.谢谢.这可是最先回答的哟....这么厉害。1/2比1/5=x比1/101/2比1/5=x比1/10x=1/2*1/10*5x=1/4