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• can,modern,subtract,divide,electronic,multiply,calculators,add,and
• machines; that; for; in; example; error; either; times; which; electronic; mechanical; or; through; than; humanA computer is a machine designed to perform work mathematically and to store and select information that has been fed into it.It is run by [51] mechanical or electronic means.These [52] can do a great deal of complicated work [53] a very short time.A large computer,for [54] ,can add or subtract nine times a second,multiply a thousand [55] a s
• 假设x,y,z∈(0,+∞）,且3^x=4^y=6^z.求证：1/z-1/x=1/(2y).
• V、________问②个八上物理问题