如图,a、b、c、d分别表示平行四边形的四条边,在这四条边中 、 互相平行.
= :20=4.5÷ = %=0.5 .
15÷ ==9: = %=0.75.
9: ==36÷ = :45= (填小数)
%= ÷8==0.75= (填成数).
6÷ == :12=0.75= %