英文文字題}equation!要有steps`急!－dvhtlbz的部落格

標題:

英文文字題}equation!要有steps`急!

發問:

1. The value of a is 4 times that of b. If their sum is 45, find the value of a. 2. If the sum of two consecutive even numbers is 46, find the values of these two numbers. 要steps!

最佳解答:

1)a=4b........................1 a+b=45....................2 Put(1)into(2) 4b+b=45 b=9 a=4b a=4(9) a=36 2)Let the one of the consecutive even numbers is A the next consecutive even numbers is (A+2) A+(A+2)=46 2A =44 A=11 So the first number is 11 the next number is 11+2=13

其他解答:

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1. The value of a is 4 times that of b means a = 4b their sum is 45 means a + b = 45 => 4b + b = 45 => 5b = 45 => b = 9. Then, a = 4x9 = 36. 2. Let x, x+2 be the two consecutive even numbers. Then, x + (x+2) = 46 => 2x = 44 => x = 22 Therefore the two consecutive even numbers are 22 and 24.|||||1. a=4b...(α) a+b=45...(β) put (α) into (β) 4b+b=45 5b=45 b=9 hence a=4x9=36 c+(c+2)=46 2c+2=46 c+1=23 c=22 hence the two consecutive even numbers are 22 and 24