①235-(456+304)÷4
②600÷[(160-76)÷7]
③95+560÷14×28
④640÷[8×(3.7+4.3)]
61-12×2=
12×5÷15=
45+85÷5=
54×9÷6=
72÷8+14=
(57+27)÷12=
268×45 =
59×705 =
470×68 =
8.35×0.58= 3.05×240= 10.3-7.89=
①3.2×4.6+3.2×5.4
②10.63-(3.63+1.25)
③7.8+4.56+2.2
①(150+80)×30- 320
②9200÷[(68+32)×23]
□○□=□( ) (够□ 不够□)