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题型:填空题 题类:常考题 难易度:困难
加法的运算定律4829 10
19+199+1999+19999+199999=
31+26={#blank#}1{#/blank#}+{#blank#}2{#/blank#}
78+235+65=78+(235+{#blank#}1{#/blank#} )
(□+○)+△={#blank#}2{#/blank#}+({#blank#}3{#/blank#}+{#blank#}4{#/blank#})
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