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题型:单选题 题类:常考题 难易度:普通
加法的运算定律4845
(739+170)+830=739+(170+830)
我这样算
①869+242+758
=1111+758
=1869
②869+242+758
=869+(242+758)
=869+1000
362+58+42={#blank#}1{#/blank#}
({#blank#}1{#/blank#}+73)+a=56+({#blank#}2{#/blank#}+{#blank#}3{#/blank#})
({#blank#}1{#/blank#}+{#blank#}2{#/blank#})+{#blank#}3{#/blank#}=70+(b+187)
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