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各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (91)
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各位知識朋友 , 入黎幫我手 ar !!!我有幾條數學問題唔識 , 幫手解答 ar( 數學F.1 )!!!!!!!!!!!!!!! (要步驟)1. Divide $790 between A,B and C so that A has $150 more thanB, and B has $80 more than C. How much does C get?A. $80B. $160C. $240D. $3602. Tally wants to vist Leo's place, which is 52 km away. He walks for x km,... 顯示更多 各位知識朋友 , 入黎幫我手 ar !!! 我有幾條數學問題唔識 , 幫手解答 ar( 數學F.1 )!!!!!!!!!!!!!!! (要步驟) 1. Divide $790 between A,B and C so that A has $150 more than B, and B has $80 more than C. How much does C get? A. $80 B. $160 C. $240 D. $360 2. Tally wants to vist Leo's place, which is 52 km away. He walks for x km, and then runs four times as far as he walks. He then travels by car for 17 km, which is the rest of the journey. How far did he run? A. 28km B. 27km C. 26km D. 25km 3. 題目網址 : http://i36.tinypic.com/23hm3rp.png
最佳解答:
1.C+(C+80)+(C+80+150)=790 3C+310=790 3C=480 C=160 1.D 2.[(52-27)/(4+1)] =35/5x4 =7x4 =28 2.A 3. (3-3x)/6=10/14x(X-3)+3/14 (3-3x)/6=(10x-30+3)/14 (3-3x)/6=(10x-27)/14 (21-21x)/42=(30x-81)/42 (21-21x)=(30x-81) 21=51x-81 102=51x x=2 3.B
其他解答:
1.) Let x be the amount of money that C get. So B has got $(x+80). So A has got $(x+150+80). (x+150+80)+(x+80)+x=790 3x+310=790 3x=480 x=160 2.) x+4x+17=52 5x=35 x=7 So, answer: 7*4=28
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