,中１數.急急急急急1元l次方程2題,答對10分

1)Let x be the number of girls.
2x+8=44
2x+8-8=44-8
2x/2=36/2
x=18
Therefore,the number of girls is 18.
2)Let x be the bigger number.
3x-x+18=78
2x+18-18=78-18
2x/2=60/2
x=30
Therefore,the bigger number is 30.

30+30-18=42
Therefore,the sum of the two numbers are 42.

(我忘記了怎樣做中文版的,但係條式是對的)

1. let y be the number of boys,
y + y + 8 =44
2y =44-8
2y =36
y =36/2
y =18

2. 3(y+18)-y=78
3y-y =78-18
2y =60
y =30

30+(30-18)
=30+12
=42

1. 設男生人數為X數, 女生人數為(X - 8)
X + (X--8)= 44
2X - 8 = 44
2X = 44 + 8
2X = 52
X = 52/2
X = 26

女生 =(X - 8 )
=26 - 8
= 18人

2. 設細數為X, 大數為(X + 18)
3(X + 18) - X = 78
3X + 54 - X = 78
3X - X = 78 - 54
2X = 24
X = 12


大數 = (X + 18)
= 12 + 18
= 30

大數 + 細數 = 30 + 12
= 42

Answer:
1.
男生:44 / 2 + 8 =30人
女生:44 - 30 = 14人

2.
78