快遞百科

標題:

17 = R + 20.9–(1.9 x R)

發問:

How to I find R? 更新: Give me the calculation in detail. pls.

最佳解答:

17 = R + 20.9–(1.9 x R) 17 = R + 20.9 - 1.9R 1.9R - R = 20.9 - 17 0.9R = 3.9 9R = 39 R = 39 / 9

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此文章來自奇摩知識+如有不便請留言告知

17 = R + 20.9 -1.9R 17-20.9 = -0.9R -3.9 = -0.9R R = 3.9/9 R= 39/9 Remarks: 1. Careful with manipulation of + - signs 2. both decimal and fractions are usually accepted, but when it comes to recurring decimals, fractions are better represenations :) Hope this is helpful.554581090DCCD3AC