①567+321=
②19+498=
③507+193=
④891-385=
⑤685-358=
⑥706-314 =
①95-9×8
②46-37+23
③(18+38)÷7
④81-(73-50)
⑤56÷(66-59)
⑥74-42÷7
综合算式: (人)
算式解决的问题是
= = =