數學(方程 , 四則運算)

1.
(a/3) x a = 12
a x a = 12 x 3
a^2 = 36
a = 6 或 a = -6


2.
987 - y = 654
-y = 654 - 987
-y = -333
y = 333


3.
16/y = 4
(16/y)y = 4y
16 = 4y
y = 4


1.
6 + 10 x (10 - 5) = 56

1)
a/3*a=12

a*a=12/3

a^2=4

a=2

2)
987-y=654

987-654=y

y=333

3)
16/y=4

y=16/4

y=4

---------------------------------------------------------------------------------------------------------

1)
(10-5)x10+6

=5x10+6

=50+6

=56

2. 987- y = 654
y = 987 - 654
y = 333
3. 16/y = 4
16 = 4y
y = 4

2009-05-07 21:37:32 補充：
四則運算
1. 用( 5 , 6 , 10 , 10 )這四個數字,計算出 56 。
(可用括號)
10(5+6/10)

2009-05-07 21:49:44 補充：
1. a/3*a = 12
(a^2)/3 = 12
a^2 = 36
a = 6

2. 987- y = 654
987-y+y=654+y
987=654+y
987-654=654+y-654
333=y