算式问题 https://www.aliyundrive.com/s/ArpbjXxW7ie/folder/61f3adbce37a3594eea143349899ce316d9161dc folder
妙用加减号 https://www.aliyundrive.com/s/ArpbjXxW7ie/folder/61f3adbcd43325b1cd704bc68956faac65ddb43c folder
图文算式 https://www.aliyundrive.com/s/ArpbjXxW7ie/folder/61f3adbb39a483d3016548b68a5560e43c0189d9 folder
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算式问题 https://www.aliyundrive.com/s/fyJpHXr35Vi/folder/624b18f1320fa7b959944fda99efea0c9e604cb3 folder
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加减法竖式谜 https://www.aliyundrive.com/s/ArpbjXxW7ie/folder/61f3adbe398596baf9a44d0e95b9de479d169ccf folder