看图列式计算. ![](http://tikupic.21cnjy.com/2024/01/03/eb/e2/ebe24fb320fc4ec57befb69cc0c41f51.jpg)
7 {#blank#}1{#/blank#} {#blank#}2{#/blank#}={#blank#}3{#/blank#}
5 {#blank#}4{#/blank#} {#blank#}5{#/blank#}={#blank#}6{#/blank#}
{#blank#}7{#/blank#} {#blank#}8{#/blank#} 5={#blank#}9{#/blank#}
12 {#blank#}10{#/blank#} {#blank#}11{#/blank#}={#blank#}12{#/blank#}