直接写出得数．50×20= 400÷20= 25×20= 45+5﹣45+5=900÷30= 660÷30= 360÷30= 45×5÷45×5=
直接写出得数．========
如果从甲袋中取出千克放入乙袋中．两袋的重量刚好相等．原来甲袋比乙袋重多少千克？
看谁算得快．========
计算．= += == ﹣= == 1=
口算．．
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千克放入乙袋中．两袋的重量刚好相等．原来甲袋比乙袋重多少千克？
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