□+○=16    □–△=3     △+4=10

□={#blank#}1{#/blank#}    △={#blank#}2{#/blank#}    ○={#blank#}3{#/blank#}

57{#blank#}1{#/blank#}65       5{#blank#}2{#/blank#}14-8           45-5{#blank#}3{#/blank#}35-5

34{#blank#}4{#/blank#}43       50+4{#blank#}5{#/blank#}4+50       9个十{#blank#}6{#/blank#}100

16-7{#blank#}1{#/blank#}15-7               20+8{#blank#}2{#/blank#}38-8

12-3{#blank#}3{#/blank#}13-4               54-50{#blank#}4{#/blank#}12-9

3+1315 15-315-4

16-107 7+1012+5