①15.3÷3 -(45.6-42.6)
②8×0.4×1.25×5
③(5.6+7.8)×(9.6-2.4)
④12+[5.5×(3.1-2.7)]
⑤2.5×3.7×4
⑥3.2×102
⑦8.9×6-3.9×6
②22÷3
③20.2÷6
④28.28÷4
①
②
③12.5×0.32×2.5
④5÷+÷5
⑤18×()×14
⑥4.5×26+45×7.4