第 19 周,简 单 的 推 理,例题一:,一个菠萝等于几个芒果重?,练习1:,1、,=,=,=,()个,2、,1头猪,2只羊,换,1只羊,换,4只兔子,2只羊,( )只兔子,1头猪,换,换,( )只兔子,例题二:,=,=,=,( ),练习2:,1、,=,=,=,=,=,=,( ),2、,1支钢笔的价格 2支中性笔的价格,1支中性笔的价格 4块橡皮的价格,3支钢笔的价格 ()块橡皮的价格,例题三:,1、,2、,- 4 = 6,= ( ),+ = 13,= ( ),9+ = 10,= ( ),- = 10,= ( ),练习3:,1、,2、,+ 5 = 12,= ( ),+ = 20,= ( ),20- = 6,= ( ),= ( ),- = 10,例题四:,+ + + + = 14,+ + + + + + = 18,= ( ),= ( ),练习4:,+ + = 24,+ + + + = 32,1、,= ( ),= ( ),2、,+ + + = 40,+ + + + + + = 55,= ( ),= ( ),例题五:,+ = 6,+ =8,= ( ),= ( ),练习5:,+ = 18,+ = 13,+ = 10,+ + = 6,1、,= ( ),= ( ),= ( ),= ( ),= ( ),2、,+ + =8,