A(19.75-17.29)÷0.81+0.4×0.5
B[(19.75-17.29)÷0.81+0.4]×0.5
C[19.75-17.29÷0.81+0.4]×0.5
D19.75-17.29÷0.81+0.4×0.5
答案: <查看本题扣1积分>
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