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9.9*9.9+0.9 =9.9x(10-0.1)+0.9 =9.9x10-9.9x0.1+0.9 =99-0.99+0.9 =99-0.09 =98.91 如果本題有什麼不明白可以追問,如果滿意請點擊“好評”
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