19-7=      11-3=      20+5=       6+20-6=

4+20=      6+6=      68-8=        8+5+2=

69-9=      40+8=      54-50=      75-5-30=

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

30+8{#blank#}1{#/blank#}8+30          73-70{#blank#}2{#/blank#}63-60

86-6{#blank#}3{#/blank#}96-6           4+50{#blank#}4{#/blank#}5+40

713 6-26-3 9+810+7