標題:
maths question (20 point)
發問:
Q8-43:Simplify thefollowing expressions 圖片參考：http://imgcld.yimg.com/8/n/HA06754289/o/701104210095213873429540.jpg 圖片參考：http://imgcld.yimg.com/8/n/HA06754289/o/701104210095213873429551.jpg Q44-56:只要列式,不用答案. 44.The sum of 3consecutive EVEN number is 90. Find the smallest one.45.The sum of two numbers is 84 .... 顯示更多 Q8-43:Simplify thefollowing expressions 圖片參考：http://imgcld.yimg.com/8/n/HA06754289/o/701104210095213873429540.jpg 圖片參考：http://imgcld.yimg.com/8/n/HA06754289/o/701104210095213873429551.jpg Q44-56:只要列式,不用答案. 44.The sum of 3consecutive EVEN number is 90. Find the smallest one. 45.The sum of two numbers is 84 . If the largenumber exceed 3 times the smaller by 4 ,what is the larger number? 46**Betty is 5kg lighter than twice the weight ofJane. Their total weight is 94kg. Find the weight of Betty. Let__be_____________ Than_____________is___________ 47**There are some $2 coins and some $5 coins. Thetotal value is $78 and the total number of coins is 21 . Find the number of $5coins Let__be_____________ Than_____________is___________ 48.**There are some $2 coins and some $5 coins.The total value is $169 and the total number of coins is 50 . Find the numberof $2 coins 圖片參考：http://imgcld.yimg.com/8/n/HA06754289/o/701104210095213873429552.jpg
最佳解答:
44.The sum of 3 consecutive EVEN number is 90. Find the smallest one.Let x be the smallest consecutive EVEN number. x + (x + 2) + (x + 4) = 90 => 3x + 6 = 90 => x + 2 = 30 => x = 2845.The sum of two numbers is 84 . If the large number exceed 3 times the smaller by 4 ,what is the larger number?Let x be the smaller number and y be the larger number. x + y = 84 --- (1) 3x + 4 = y --- (2)Put (2) into (1): x + (3x + 4) = 84 4x + 4 = 84 x = 20 --- (3)Put (3) back into (2): 3(20) + 4 = y y = 64i.e. The larger number is 64. For more detials, you may refer to http://healthymethod.blogspot.com/2011/04/44.html
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