{#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#}

6×5=          4×5=          4×4=          4×3=

3×3=            2×6=            4×2=            5×5=

5×6+5=         6×6-3=            3×5-6=            78-6×3=

7×3{#blank#}1{#/blank#}13                4×5－5{#blank#}2{#/blank#}3×5＋5          1小时{#blank#}3{#/blank#}60分

6＋6{#blank#}4{#/blank#}6×6            47＋23{#blank#}5{#/blank#}60                   1米{#blank#}6{#/blank#}90厘米

你知道“百鸟”是怎么计算得来的吗？