①
②
③
④
×6÷×6=
2.7:0.3 : 35:42 :3
1+25%= = = = =
42× = 10÷0.5= 10×50%= 3.5+ = =
- = × = 80÷10%= 42×3.14=
30%+0.45= 3.6÷0.18= 2- = 6- - =