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56×113+59×213+518×613．
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▼优质解答
答案和解析
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5 5 56 6 6×
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1 1 113 13 13+
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5 5 59 9 9×
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2 2 213 13 13+
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5 5 518 18 18×
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6 6 613 13 13
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