试题 试卷
题型：填空题 题类：常考题 难易度：普通
加法的运算定律4841
87＋46＝46＋
a+20{#blank#}1{#/blank#}20+a 496-120-230{#blank#}2{#/blank#}496-(120+230)
280-70+30{#blank#}3{#/blank#}280-(70+30) 12+(8+13){#blank#}4{#/blank#}(12+8)+13
234+45×32{#blank#}5{#/blank#}32×45+234 192+(95—75){#blank#}6{#/blank#}192+95+75
46+18-26 52-14+78
255+257+145 341-68-132
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