如何巧算(2×2.39-0.13—1)÷(2.39+2×0.13+1)
3个回答
[2(2+3×0.13)-0.13-1]÷[(2+3×0.13)+2×0.13+1]
=(3+5×0.13)÷(3+5×0.13)
=1
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