1.15.3+4 X=63.3
2.40-12.9M=14.2
1.2唔該幫做驗算....
3.r（1+27%）=38.1
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2011-01-25 5:02 am
回答 (1)
2011-01-25 7:22 am
✔ 最佳答案
1)15.3 + 4x = 63.34x = 63.3 - 15.34x = 48x = 48/4x = 12驗算 : 15.3 + 4(12) = 15.3 + 48 = 63.32)40 - 12.9M = 14.240 = 14.2 + 12.9M40 - 14.2 = 12.9M25.8 = 12.9M25.8 / 12.9 = MM = 2驗算 : 40 - 12.9(2) = 40 - 25.8 = 14.2
3)r (1 + 27%) = 38.1r (1 + 27/100) = 38.1r (1 + 0.27) = 38.11.27 r = 38.1r = 38.1 / 1.27r = 30驗算 : 30 (1 + 27%) = 30(1.27) = 38.1
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