各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (28)

1. Let the number be y,

(2 x y) + (6 / 3) = 12
2y + 2 = 12
2y = 10
y = 5

2. Let the number be y,

20 - (y x 2) = 4 sqaure
20 - 2y = 16
2y = 4
y = 2

3. Let the first number is y,

y + (y+1) + (y+1+1) = 54
y + y + 1 + y + 1 + 1 = 54
3y + 3 = 54
3y = 51
y = 17

so, the three consecutive numbers are 17, 18 and 19

4. Let y the first even number,

y + (y+2) + (y+2+2) = 42
y + y + 2 + y +2 + 2 = 42
3y + 6 = 42
3y = 36
y = 12

so, the three consectuive even numbers are 12, 14 and 16

1. 當2 次的總和數字和6 由3 劃分, 結果是12 。
看到數字。

2. 20 減數字的產品和2 與正方形是相等的4 。
看到數字。

3. 三個連貫數字的總和是54 。看到三個數字。

他求和三個連貫偶數的4.T 是42 。看到三個數字

Let x be the number.
2x+(6over3)=12
2x+2=12
2x=10
x=5
So,the number is 5.

Let x be the number.
20-2x=4^2
20-16=2x
4=2x
x=2
So,the numder is 2.

Let x be the smallest number.
x+(x+1)+(x+2)=54
3x+3=54
3x=51
x=17
So,the three numbers are 17, 18, 19 .

Let x be the smallest number.
x+(x+2)+(x+4)=42
3x+6=42
3x=36
x=12
So,the three numbers are 12 , 14 , 16 .

1. Let x be the number

(2x + 6) /3 = 12
2x + 6 = 36
2x = 30
x = 15


2. Let x be the number

20 - 2x = 4^2
20 - 2x = 16
2x = 4
x = 2


3. Let the 3 numbers be x, x+1 and x+2,

x + (x+1) +(x+2) = 54
3x + 3 = 54
3x = 51
x = 17
so the 3 numbers are: 17, 18 and 19


4. Let the 3 numbers be x, x+2 and x+4

x + (x+2) + (x+4) = 42
3x + 6 = 42
3x = 36
x = 12
so the 3 number are 12, 14 and 16

1.When the sum of 2 times a number and 6 is divided by 3, the result is 12.
Find the number.

let x be the number
(2x+6)/3=12
2x+6=36
2x=30
x=15

2. 20 minus the product of a number and 2 is equal to the square of 4.
Find the number.

Let x be the number
20-2x=4^2
20-16=2x
4=2x
x=2


3. The sum of three consecutive numbers is 54. Find the three numbers.
Let the three number is x , x+1 , x+2
x+x+1+x+2=54
3x+3=54
3x=51
x=17

4.T he sum of three consecutive even numbers is 42. Find the three numbers

Let the three number is x,x+2,x+4
x+x+2+x+4=42
3x+6=42
3x=36
x=12