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덧셈과 뺄셈의 혼합계산에서는 덧셈을 반드시 먼저 계산한다.
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108-74+80= (a)
다음 식 중 두 번째로 계산해야 하는 부분의 기호를 써주세요.
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48-(21+19)= (a)
25-11+5의 값과 25-(11+5)의 값은 같다.
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10 questions
การบวกลบจำนวนเต็ม9
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