粮店运进大米和面粉各20袋，每袋大米30千克，每袋面粉25千克，运进的大米比面粉多多少千克？
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直接写出得数．== 1﹣= 4﹣=====
计算下面各题．．
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++﹣+﹣+﹣．
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= 1﹣
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．
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+
+
﹣
+
﹣
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﹣
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