一批零件160个,经检测有8个不合格,合格率是 %,为了使合格率尽快达到98%,至少还要生产 个合格的零件.
5:8== ÷40= (小数)= %.
3÷ ===0.75.
2÷ =8: =0.75= %= .
20%= ÷40=40: = [填小数]=× .
÷12===10÷( )=.