72，66，{#blank#}1{#/blank#}，{#blank#}2{#/blank#}，{#blank#}3{#/blank#}，{#blank#}4{#/blank#}，{#blank#}5{#/blank#}，{#blank#}6{#/blank#}，{#blank#}7{#/blank#}，{#blank#}8{#/blank#}，{#blank#}9{#/blank#}，6，0

擦桌椅的有{#blank#}1{#/blank#}人？

{#blank#}2{#/blank#}×{#blank#}3{#/blank#}={#blank#}4{#/blank#}(人)

12{#blank#}1{#/blank#}6×6

21÷3{#blank#}2{#/blank#}35÷7

10÷2{#blank#}3{#/blank#}5

42÷7{#blank#}4{#/blank#}24÷6

2×5=        6×3=        4×3=        2×3+19=

80-3=        7+55=        6×2=        3×3+2=

4×6=        5×5=        4×5=        6×6-7=

6×5=        3×5=        87-25=        4×2+45=

口答：一共有（       ）个气球。