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题型:填空题 题类:常考题 难易度:普通
加法的运算定律4837 10
(256+78)+=256+(+222)
560+(140+70)=(560+{#blank#}3{#/blank#})+{#blank#}4{#/blank#}
78+235+65=78+(235+{#blank#}1{#/blank#} )
(□+○)+△={#blank#}2{#/blank#}+({#blank#}3{#/blank#}+{#blank#}4{#/blank#})
①167+289+33
②58+39+42
③378+527+73
④2×7×5
⑤70×5×2
62+46+38=({#blank#}1{#/blank#}+{#blank#}2{#/blank#})+46
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