1.John is x years old now.Two years later,Susan's age will be twice of John.What is Susan's age now?
2.Which of the following algebraic expressions represents "Subtract 24 from the product of 2x and 9"?
3.Divide x by y and then add the quotient to the sum of 4 and x.The algebraic expression is ?
4.If P=3x-4y,find P when x=8 and y=1.
5.If x-3y=2-4x,find y when x=4.
中一數(急)
2007-08-30 3:45 am
回答 (2)
2007-08-30 3:58 am
✔ 最佳答案
1) x+2=2xx=1
susan's age=2x=2
2)2x*9-24=18x-24
3) x/y+4+x
4)P=3(8)-4(1)=20
5) 4-3y=2-4(4)
4-3y=-14
3y=18
y=6
2007-08-30 4:00 am
1. let y be Susan's age,
2(x+2) = y+2
y = 2x + 2
2. 9(2x) - 24 = 18x - 24
3. x/y + (4+x)
4. P = 3(8) - 4(1) = 24 - 4 = 20
5. (4) - 3y = 2 - 4(4)
-3y = -18
y = 6
2(x+2) = y+2
y = 2x + 2
2. 9(2x) - 24 = 18x - 24
3. x/y + (4+x)
4. P = 3(8) - 4(1) = 24 - 4 = 20
5. (4) - 3y = 2 - 4(4)
-3y = -18
y = 6
參考: myself
收錄日期: 2021-04-13 13:10:59
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