50760000 读作 ,改写用“万”作单位的数是 .
4: ==12÷ = %=八折.
÷ == %= : = =七五成.
6:8=3: =12÷ = ÷12=.
÷8=0.75== %= 折.
0.625=== ÷40=40÷ .