解方程 y=乜?

10.5=3+5y
7.5=5y
y=1.5

10.5=3+5y

10.5-3=3+5y-3

7.5=5y

y=1.5

10.5 = 3+5y

10.5-3 = 5y

7.5 = 5y

7.5/5 = 5y/5

1.5 = y

y = 1.5

10.5-3=5y

7.5/5=y

1.5=y

y=1.5

10.5=3+5y

10.5-3=5y

7.5=5y

7.5/5=5y/5

1.5=y

y=1.5

10.5=3+5y

10.5-3=5y

7.5=5y

7.5/5=5y/5

1.5=y

y=1.5

答案:1.5

10.5=3+5y

10.5-3=3+5y-3

7.5=5y

7.5~~5y
-----=-------
~5~~~5~

1.5=y

y=1.5

10.5 = 3 + 5y
10.5 - 3 = 5y
7.5 = 5y
7.5 / 5 = y
2.1 = y
y = 2.1 ( 因為代數 (( x )) 通常係會放起 左邊 )

2007-12-06 21:12:04 補充：
惑該係 1.5，寫錯佐

10.5=3+5y
y=______


5y=10.5-3
5y=7.5
y=7.5/5
y=1.5

y = 1.5
10.5-3 sin and then divide 5 again law

10.5=3+5y
10.5-3=3+5y-3
7.5=5y
7.5÷5=5y÷5
1.5=y

y=1.5

5y = 10.5 - 3
5y = 7.5
y = 1.5