①4.85×3-3.6+6.15×3
②55×66÷(11×11)
③7.63×9.9+0.763
x:10=6:5 = 0.4:3.2=x:9.6
3+150%=
×2.1=
56%-39%=
5%×10=
0.35×(-60%)=
6%+12.4=
2÷10%=
÷=
1-99%=
×6÷×6=
12:18和24:36 :和0.5:2 :和:
×[-(-)] ×+÷
= 28%:6=x:25