在横线里填上合适的质数.12=______+______=______+______+______20=______+______=______+______30=____
在横线里填上合适的质数.12=______+______=______+______+______20=______+______=______+______30=___...
在横线里填上合适的质数.12=______+______=______+______+______20=______+______=______+______30=______×______×______39=______+______=______-______.
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