標題:
HELP!! f.2 maths, 5 qus. only!(20 marks)
發問:
最佳解答:
√45x√36 = 3√5 x√ 6 = 3√30 √108x√135 = (6√3) x (3√15) = 18√45 √11/28x√7/9 = (√11) / (2√7) x (√7) / (3) = √11 / (6) √44/9x√16/5 = (2/3)√11 x (4/√5) = (8/3)(√11/√5) √0.25x√0.04 = √(100 / 4) x √(1/25) = 10/2 x 1/5 = 1 2007-03-05 17:23:17 補充： sorry....for question 1√45x√36= 3√5 x 6= 18√5 2007-03-05 17:24:21 補充： for question 2√108x√135= (6√3) x (3√15)= 18√45= 54√5 2007-03-05 17:25:23 補充： for 5)√0.25x√0.04= √(1 / 4) x √(1/25)= 1/2 x 1/5= 1 / 10
其他解答:
1) √45x√36 = √3x3x5 x √2x2x3x3 =3√5 x 6 =18√5 2) √108 x √135 = √2x2x3x3x3 x √3x3x3x5 = 6√3 x 3√3x5 = 18x3√5 =54√5 3) & 4) I don't know how to do..... Sorry!!! 5) √0.25 x √0.04 =√0.5x0.5 x √0.2x0.2 =0.5x0.2 =0.1 P.S. I am only a P.6 student, but I like Maths very much. I am sorry that I really don't know how to do 3) & 4)|||||√45x√36 =√5x√9x 6 =√5x 3 x 6 =18√5 √108x√135 =√4x√27x√5x√27 =2x27x√5 =54√5 √11/28x√7/9 =[√11/(√4x√7)] x (√7/√9) =(√11/√4) x (1/√9) =(√11/2) x (1/3) =√11/6 √44/9x√16/5 =[(√4x√11)/√9] x(√16/√5) =[(2x√11)/3] x 4/√5 =(2x√11x4) / (3 x√5) =8√11 / 3√5 =8√5√11 / 15 =8√55 / 15 √0.25x√0.04 =(√25/√100) x(√4/√100) =(5/10) x (2/10) =10/100 =1/10|||||√45 x √36 = 3√5 x 6 = 18√5 √108 x √135 = 6√3 x 3√15 = 18√45 = 54√5 √11/28 x √7/9 = √(11/36) = (√11) / 6 √44/9 x √16/5 = √(704 / 45) = (8√11) / (3√5) = (8√55) / 15 √0.25 x √0.04 = 0.5 x 0.2 = 0.1|||||1) 6√45 2) 54√5 3) √11/6 4) 8√11/3√5 5) 0.1 不知有沒有看錯題目? 2007-03-05 17:27:19 補充： 1)18√5
HELP!! f.2 maths, 5 qus. only!(20 marks)
發問:
此文章來自奇摩知識+如有不便請留言告知
√45x√36 √108x√135 √11/28x√7/9 √44/9x√16/5 √0.25x√0.04 plz show steps, the fastest one hav 20 marks!!! 更新: simpify!最佳解答:
√45x√36 = 3√5 x√ 6 = 3√30 √108x√135 = (6√3) x (3√15) = 18√45 √11/28x√7/9 = (√11) / (2√7) x (√7) / (3) = √11 / (6) √44/9x√16/5 = (2/3)√11 x (4/√5) = (8/3)(√11/√5) √0.25x√0.04 = √(100 / 4) x √(1/25) = 10/2 x 1/5 = 1 2007-03-05 17:23:17 補充： sorry....for question 1√45x√36= 3√5 x 6= 18√5 2007-03-05 17:24:21 補充： for question 2√108x√135= (6√3) x (3√15)= 18√45= 54√5 2007-03-05 17:25:23 補充： for 5)√0.25x√0.04= √(1 / 4) x √(1/25)= 1/2 x 1/5= 1 / 10
其他解答:
1) √45x√36 = √3x3x5 x √2x2x3x3 =3√5 x 6 =18√5 2) √108 x √135 = √2x2x3x3x3 x √3x3x3x5 = 6√3 x 3√3x5 = 18x3√5 =54√5 3) & 4) I don't know how to do..... Sorry!!! 5) √0.25 x √0.04 =√0.5x0.5 x √0.2x0.2 =0.5x0.2 =0.1 P.S. I am only a P.6 student, but I like Maths very much. I am sorry that I really don't know how to do 3) & 4)|||||√45x√36 =√5x√9x 6 =√5x 3 x 6 =18√5 √108x√135 =√4x√27x√5x√27 =2x27x√5 =54√5 √11/28x√7/9 =[√11/(√4x√7)] x (√7/√9) =(√11/√4) x (1/√9) =(√11/2) x (1/3) =√11/6 √44/9x√16/5 =[(√4x√11)/√9] x(√16/√5) =[(2x√11)/3] x 4/√5 =(2x√11x4) / (3 x√5) =8√11 / 3√5 =8√5√11 / 15 =8√55 / 15 √0.25x√0.04 =(√25/√100) x(√4/√100) =(5/10) x (2/10) =10/100 =1/10|||||√45 x √36 = 3√5 x 6 = 18√5 √108 x √135 = 6√3 x 3√15 = 18√45 = 54√5 √11/28 x √7/9 = √(11/36) = (√11) / 6 √44/9 x √16/5 = √(704 / 45) = (8√11) / (3√5) = (8√55) / 15 √0.25 x √0.04 = 0.5 x 0.2 = 0.1|||||1) 6√45 2) 54√5 3) √11/6 4) 8√11/3√5 5) 0.1 不知有沒有看錯題目? 2007-03-05 17:27:19 補充： 1)18√5
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