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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4835 10
699+736+101=
50+A=A+50{#blank#}1{#/blank#}30+A+70=(30+70)+A{#blank#}2{#/blank#}
a+(60+40)=a+60+40{#blank#}3{#/blank#}50+70+150+230=(50+150)+(70+230){#blank#}4{#/blank#}
189+326+274={#blank#}1{#/blank#}
{#blank#}1{#/blank#}+246+178
(48+86)+14=48+(86+14)
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