小学数学六年级下册一课3练44页的答案1千克大米,吃了一半,还剩15%千克大米(判断对还是错)( )分之( )=( )%=( )÷40=40:( )=0.2用200粒种子做发芽实验 ,有22粒没法呀,发芽率是( )

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