①
②
③
④
⑤
⑥
=
2.4 ×=
÷8=
×27=
6+=
×8-=
⑴12×=
×7.2=
12÷=
×=
⑵0÷=
0.42÷=
÷=
+=
⑶÷2=
1.8×=
÷0.5=
-=
⑷÷+=
1--=
×9 ÷=
×÷×=
0.25××0.4×8
①÷12÷
②×÷
③÷÷
④××
⑤÷÷
⑥÷×