⑴12:4=6:x
⑵x:5=2.5:0.1
⑶:x:
⑷
=
10﹣10%=
8×12.5%=
0.3×0.4=
2.95+0.5=
2÷0.25=
[1-(+)]÷ 2÷× (8.9-7.7)÷0.2×0.15
205+97= 3.01﹣0.1= 0.25×3×4= 36×25%=
3×a×a= ×1.6= 4÷25%= 16.4+3.06=
1﹣ ÷ = ( ﹣ )÷ =