①m一定是偶数、②(m,n)=4③n是m的25%④m:4=n:1⑤ (n÷10) × (4÷10) =m
215-108=
42.3÷77=
×0=
▲9.9×9÷1=
12-÷4=
25×20=
12-=
1.1×0.01=
1÷-×1=
a÷÷2a=
①0.75x-0.25=11
②x+x=0.875
③x:=:
①1675-475÷19×25
②27.3-2.7-77.3+73.7
③2.67×2.5+5.33×2.5+5
④12.5×44
⑤
⑥