两堆货物原来相差a吨,如果两堆货物各运走20%,剩下的货物相差仍然是a吨. .
60%= :15== ÷20= (写小数)
:10=18: =50%=6: = ÷60.
35: =20÷16== %= (填小数)
:3=10: ==1.5: .
30:42==45÷ ≈ %.