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有1題數學題5識呀.....help help 我 thz~! (10點)

發問:

Learning from Mistakes ___________________ Peter claims that when a number x is increased by 10% and then decreased by 10% , the value of x is unchanged. His calculation：x ( 1 + 10% - 10% )=x Peter is wrong.Point out the mistake

最佳解答:

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It must be:x(1+10%)(1-10%) but x ( 1 + 10% - 10% ) means that once you have x ,then you have x's 10% more and then lose x's 10%

其他解答:

=x(1+10%)(1-10%)|||||a * 1.1 = 1.1a 1.1a x (1-0.1) = 1.1a x 0.9 = 0.99a
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