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Read about this equation already?
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6÷ 2( 1+2)=?

這條近日在 facebook上熱傳、小四程度的數學題,吸引 342萬網民嘗試解答。結果有 149萬名網民答案為 1而答錯,正確答案是 9。

擅長數學的台北教育大學資訊科學系教授王富祥解釋,小括號內的 1+2先算,之後算式變成 6÷ 2× 3,依算式左至右計算。

台灣數學專家認為,很多人答錯是因忘記由左至右計算、先乘除後加減的原則。台灣的教育部則批評算式題意不清,後面 2( 1+2)應寫 2×( 1+2);但有四成四人答錯,確實要進行針對性的檢討。

Posted on: 2011/5/5 14:57
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