関連ワード:  what is computer system for class 7    what is computer system class 7th    what is multimedia computer system class 7    what is number system computer class 7    what is number system in computer for class 7 with examples    what is number system in computer for class 7 worksheet    what is number system in computer for class 7 pdf    what is number system in computer for class 7 ppt    what is a computer system short answer class 7    what is decimal number system in computer for class 7