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數學問題!!希望盡快回答!!

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1 ) 809 , 2547 .3984 .2003 .213 .1997 的羅馬數字?? 2) if the area of a rectangle is 40 cm^2 and its length and width are 8 cm and w cm respectively .find the value of w ? 3) tom is 3 year younger than his sister .the sum of the ages of tom and his sister is 23 .how old is tom ? 4) in a test ,mary get x... 顯示更多 1 ) 809 , 2547 .3984 .2003 .213 .1997 的羅馬數字?? 2) if the area of a rectangle is 40 cm^2 and its length and width are 8 cm and w cm respectively .find the value of w ? 3) tom is 3 year younger than his sister .the sum of the ages of tom and his sister is 23 .how old is tom ? 4) in a test ,mary get x marks and john gets 90 marks ,john's score is 10 less than twice mary 's ,find x ? 5) 百份數化小數: 15又4 分之3 6)小數化百份數: a)0.47 b )0.6 c) 0.016 d ) 3.048 e ) 1.015

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1 ) 809 , 2547 .3984 .2003 .213 .1997 的羅馬數字?? 809 = DCCCIX 2547 = MMDXLVII 3984 = MMMCMLXXXIV 2003 = MMIII 213 = CCXIII 1997 = MCMXCVII 2) if the area of a rectangle is 40 cm^2 and its length and width are 8 cm and w cm respectively .find the value of w ? 8w = 40 w = 5 3) tom is 3 year younger than his sister .the sum of the ages of tom and his sister is 23 .how old is tom ? Let y be the age of Tom = y Then, the age of his sister = y + 3 y + (y + 3) = 23 2y + 3 = 23 2y = 20 y + 10 The age of Tom = 10 4) in a test ,mary get x marks and john gets 90 marks ,john's score is 10 less than twice mary 's ,find x ? 2x - 90 = 10 2x = 100 x = 50 5) 百份數化小數: 15又4 分之3 15又(3/4)% = 15.75 x (1/100) = 0.1575 6)小數化百份數: a)0.47 b )0.6 c) 0.016 d ) 3.048 e ) 1.015 a) 0.47 0.47 x 100% = 47% b) 0.6 = 0.6 x 100% = 60% c) 0.016 = 0.016 x 100% = 1.6% d) 3.048 = 3.048 x 100% = 304.8% e) 1.015 = 1.015 x 100% = 101.5%

其他解答:

2. 40=(8+w)x2 w=12cm 3.let tom is x years old x+x+3=23 x=20 tom is 20 years old8758B59A7FA1EEA7