⑴12×=
×7.2=
12÷=
×=
⑵0÷=
0.42÷=
÷=
+=
⑶÷2=
1.8×=
÷0.5=
-=
⑷÷+=
1--=
×9 ÷=
×÷×=
×4= 16÷ = × = 0.8× =
0.25+ = ×2.4= ÷4= ÷4÷ =
÷2=
14÷=
+6÷30 =
1×=
0÷=
8.1÷0.03=
0.375×16=
×15= ×2= × = × =
÷ = ÷3= ÷5= ÷ =
÷5=
÷14=
÷7=
×3= ×= ×= ÷= (+)×15=
÷2= ÷= ÷= ×= 12÷(1-)=