摘要：用计算器计算124×.按键的顺序为 A. 1 2 x2 4 × 1 ab/c 1 ab/c 5 = B. 1 2 4 xy × 1 ab/c 1 ab/c 5 = C. 1 2 x2 4 × 1 ab/c 5 ab/c 1 = D. 1 2 x2 4 × 1 ab/c 5 ab/c 1 =

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