练习五走迷宫混合运算和三位数加减法综合练习走出迷宫。(不能从同一个门进出)参考答案走法不唯一,合理即可。556-478+120=198502-247+129=384960-(374+92)=494776-248-345=183199+209-187=221289+564-66=787643-(343-176)=476758-(239+184)=335709-(308+155)=246900-336+126=690255+345-168=432826-428-89=309100+347-179=268128+67-122=73
