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＊F.3 MATHS! (RATIONAL...)
發問:
6. (/5-/2)(/3-1)= A. 2/5-2/2 B. /15-/5-2/2 C. 2/5-/6+/2 D. /15-/6-/5+/27. (/6-/5) <---2次 = A. 1-/30 B. 1-2/30 C. 11-/30 D. 11-2/308. /48+/75-/108= A. /15 B. 3/3 C. 4/3 D. 5/39. 2/45-/80+/180= A. 8/5 B. 38/5 C. 2/70 D. /19010. /24+/28+/175-/96= A. 5 B. /131 C. 7/7-2/6 ... 顯示更多 6. (/5-/2)(/3-1)= A. 2/5-2/2 B. /15-/5-2/2 C. 2/5-/6+/2 D. /15-/6-/5+/2 7. (/6-/5) <---2次 = A. 1-/30 B. 1-2/30 C. 11-/30 D. 11-2/30 8. /48+/75-/108= A. /15 B. 3/3 C. 4/3 D. 5/3 9. 2/45-/80+/180= A. 8/5 B. 38/5 C. 2/70 D. /190 10. /24+/28+/175-/96= A. 5 B. /131 C. 7/7-2/6 D. 29/7-12/6
6. (√5-√2)(√3-1)= A. 2√5-2√2 B. √15-√5-2√2 C. 2√5-√6+√2 D. √15-√6-√5+√2 (√5-√2)(√3-1) = √5√3-√5-√2√3+√2 = √15-√6-√5+√2 (Answer D) ================================================ 7. (√6-√5)2 = A. 1-√30 B. 1-2√30 C. 11-√30 D. 11-2√30 (√6-√5)2 = (√6-√5)(√6-√5) = 6 - 2√6√5 + 5 = 11 - 2√30 (Answer D) ================================================ 8. √48+√75-√108= A. √15 B. 3√3 C. 4√3 D. 5√3 √48 + √75 - √108 = √16√3 + √25√3 - √36√3 = 4√3 + 5√3 - 6√3 = 3√3 (Answer B) ================================================ 9. 2√45-√80+√180= A. 8√5 B. 38√5 C. 2√70 D. √190 2√45 - √80 + √180 = 2√9√5 - √16√5 + √36√5 = 2(3)√5 - 4√5 + 6√5 = 6√5 - 4√5 + 6√5 = 8√5 (Answer A) ================================================ 10. √24+√28+√175-√96= A. 5 B. √131 C. 7√7-2√6 D. 29√7-12√6 √24+√28+√175-√96 = √4√6 + √4√7 + √25√7 - √16√6 = 2√6 + 2√7 + 5√7 - 4√6 = -2√6 + 7√7 = 7√7 - 2√6 (Answer C)
其他解答:
6. D 7. D 8. B 9. A 10. C 2006-11-24 14:17:51 補充： 6. (/5-/2)(/3-1)= /15 - /5 -/6 /2= /15 -/6 -/5 /2= D7.(/6-/5) 2006-11-24 14:21:09 補充： 食左D 字 .... 2006-11-24 14:21:11 補充： 食左D 字 .... 2006-11-24 14:22:02 補充： 食左D 字 >....<7.(/6-/5) <---2次= (/6)^2 - 2(/6)(/5) (/5)= 6 - 2/30 5= 11 - 2/30= D8./48 /75-/108= /(16 x 3) /(25 x 3) - /(36 x 3)= 4/3 5/3 - 6/3= 3/3= B 2006-11-24 14:22:30 補充： 9.2/45-/80+/180= 2/(9 x 5) - /(16 x 5) + /(36 x 5)= 2 x (3/5) - 4/5 + 6/5= 6/5 - 4/5 + 6/5= 8/5= A10./24+/28+/175-/96= /(4 x 6) + /(4 x 7) + /(25 x 7) - /(16 x 6)= 2/6 + 2/7 + 5/7 - 4/6= -2/6 + 7/7= 7/7 - 2/6= C希望幫到你
＊F.3 MATHS! (RATIONAL...)
發問:
6. (/5-/2)(/3-1)= A. 2/5-2/2 B. /15-/5-2/2 C. 2/5-/6+/2 D. /15-/6-/5+/27. (/6-/5) <---2次 = A. 1-/30 B. 1-2/30 C. 11-/30 D. 11-2/308. /48+/75-/108= A. /15 B. 3/3 C. 4/3 D. 5/39. 2/45-/80+/180= A. 8/5 B. 38/5 C. 2/70 D. /19010. /24+/28+/175-/96= A. 5 B. /131 C. 7/7-2/6 ... 顯示更多 6. (/5-/2)(/3-1)= A. 2/5-2/2 B. /15-/5-2/2 C. 2/5-/6+/2 D. /15-/6-/5+/2 7. (/6-/5) <---2次 = A. 1-/30 B. 1-2/30 C. 11-/30 D. 11-2/30 8. /48+/75-/108= A. /15 B. 3/3 C. 4/3 D. 5/3 9. 2/45-/80+/180= A. 8/5 B. 38/5 C. 2/70 D. /190 10. /24+/28+/175-/96= A. 5 B. /131 C. 7/7-2/6 D. 29/7-12/6
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最佳解答:6. (√5-√2)(√3-1)= A. 2√5-2√2 B. √15-√5-2√2 C. 2√5-√6+√2 D. √15-√6-√5+√2 (√5-√2)(√3-1) = √5√3-√5-√2√3+√2 = √15-√6-√5+√2 (Answer D) ================================================ 7. (√6-√5)2 = A. 1-√30 B. 1-2√30 C. 11-√30 D. 11-2√30 (√6-√5)2 = (√6-√5)(√6-√5) = 6 - 2√6√5 + 5 = 11 - 2√30 (Answer D) ================================================ 8. √48+√75-√108= A. √15 B. 3√3 C. 4√3 D. 5√3 √48 + √75 - √108 = √16√3 + √25√3 - √36√3 = 4√3 + 5√3 - 6√3 = 3√3 (Answer B) ================================================ 9. 2√45-√80+√180= A. 8√5 B. 38√5 C. 2√70 D. √190 2√45 - √80 + √180 = 2√9√5 - √16√5 + √36√5 = 2(3)√5 - 4√5 + 6√5 = 6√5 - 4√5 + 6√5 = 8√5 (Answer A) ================================================ 10. √24+√28+√175-√96= A. 5 B. √131 C. 7√7-2√6 D. 29√7-12√6 √24+√28+√175-√96 = √4√6 + √4√7 + √25√7 - √16√6 = 2√6 + 2√7 + 5√7 - 4√6 = -2√6 + 7√7 = 7√7 - 2√6 (Answer C)
其他解答:
6. D 7. D 8. B 9. A 10. C 2006-11-24 14:17:51 補充： 6. (/5-/2)(/3-1)= /15 - /5 -/6 /2= /15 -/6 -/5 /2= D7.(/6-/5) 2006-11-24 14:21:09 補充： 食左D 字 .... 2006-11-24 14:21:11 補充： 食左D 字 .... 2006-11-24 14:22:02 補充： 食左D 字 >....<7.(/6-/5) <---2次= (/6)^2 - 2(/6)(/5) (/5)= 6 - 2/30 5= 11 - 2/30= D8./48 /75-/108= /(16 x 3) /(25 x 3) - /(36 x 3)= 4/3 5/3 - 6/3= 3/3= B 2006-11-24 14:22:30 補充： 9.2/45-/80+/180= 2/(9 x 5) - /(16 x 5) + /(36 x 5)= 2 x (3/5) - 4/5 + 6/5= 6/5 - 4/5 + 6/5= 8/5= A10./24+/28+/175-/96= /(4 x 6) + /(4 x 7) + /(25 x 7) - /(16 x 6)= 2/6 + 2/7 + 5/7 - 4/6= -2/6 + 7/7= 7/7 - 2/6= C希望幫到你
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