負數負數(幫下手啦)

1. z/3y
z=-3和y=2代入原式:-3/3*2=-1/2
2. y-z
把z=-3和y=2代入原式:2-﹝-3﹞=5
3. 2z+y
把z=-3和y=2代入原式:2*﹝-3﹞+2=-4
4.4zy
把z=-3和y=2代入原式:4*﹝-3﹞*2=-24

1. abc
把a=-2，b=3 和c=-1代入原式:-2*3*﹝-1﹞=6
2. -a-(-b)+c
把a=-2，b=3 和c=-1代入原式:-﹝-2﹞-(-3)+(-1)=2+3-1=4
3. 2a-b-c
把a=-2，b=3 和c=-1代入原式:-2*2-3-1*(-1)=-4-3+1=-6
4. a+b/c
把a=-2，b=3 和c=-1代入原式:-2+3/-1=-2-3=-5
其實第四條你是否想表達成 (a+b)/c=(-2+3)/-1=-1

負數負數(幫下手啦)

等我幫下手啦！給過程你看

當z=-3和y=2時，求下列各代數式的值。

1. z/3y 2. y-z
=(-3)/3(2)
=-3/6
=-1/2
=-0.5//

2. y-z
=(2)-(-3)
=2+3
=5//

3. 2z+y
=2(-3)+(2)
=-6+2
=-4//

4. 4zy
=4(-3)(2)
=8(-3)
=-24//

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

當a=-2，b=3 和c=-1時，求下列各代數式的值。

1. abc
=(-2)(3)(-1)
=(2)(3)
=6//

2. -a-(-b)+c
=-(-2)-[-(3)]+(-1)
=2+3-1
=4//

3. 2a-b-c
=2(-2)-(3)-(-1)
=-4-3+1
=-6//

4. a+b/c
=(-2)+(3)/(-1)
=(-2)+(-3)
=-2-3
=-5//

只要記著負負得正就會識做！︿＿︿

當 z = - 3 和 y = 2 時,

1. z / 3y = - 3 / 6 = -1 / 2

2. y - z = 2 - ( - 3 ) = 2 + 3 = 5

3. 2 z + y = 2 ( - 3 ) + 2 = - 6 + 2 = - 4

4. 4 z y = 4 ( - 3) ( 2 ) = - 24


當 a = - 2 ，b = 3 和 c = - 1時,

1. a b c = ( - 2) ( 3 ) ( - 1 ) = 6

2. - a - ( - b ) + c = - ( - 2 ) - ( - 3 ) + ( - 1) = 2 + 3 - 1 = 4

3. 2 a - b - c = 2( - 2) - 3 - ( - 1) = - 4 - 3 + 1 = - 6

4. 呢題我唔係好明你想講 a + b / c 定係 ( a + b ) / c ,因為兩者的答案係唔相同既..

a + b / c = ( - 2 ) ( - 3 ) = 6

( a + b ) / c = ( - 2 + 3 ) / ( - 1) = - 1

2007-07-28 15:32:50 補充：
4. 呢題我唔係好明你想講 a b / c 定係 ( a b ) / c ,因為兩者的答案係唔相同既..a b / c = ( - 2 ) ( - 3 ) = - 5 ( a b ) / c = ( - 2 3 ) / ( - 1) = - 1

1. z/3y
=-3/3(2)
=-3/6
=-1/2

2. y-z
=2-(-3)
=2+3
=5

3. 2z+y
=2(-3)+2
=-6+2
=-4

4. 4zy
=4(-3)(2)
=-24
----------------------------------------------------------
1. abc
=(-2)(3)(-1)
=6

2. -a-(-b)+c
=-(-2)-(-3)+(-1)
=2+3-1
=4

3. 2a-b-c
=2(-2)-3-(-1)
=-4-3+1
=-6

4. a+b/c
=-2+3/-1
=-2+(-3)
=-2-3
+-5

2007-07-28 15:16:39 補充：
4. a+b/c=-2+3/-1=-2+(-3)=-2-3=-5

1. z/3y
= -3/6
= -0.5
2. y-z
= 2-(-3)
= 5
3. 2z+y
= -6+2
= -4
4. 4zy
= -24

1. abc
= 6
2. -a-(-b)+c
= 2-(-3)+(-1)
= 6
3. 2a-b-c
= -4-3-(-1)
= -6
4. a+b/c
= -2+(-3)
= -5

1.1/2
2.-2
3.8
4.24
1.6
2.2
3.0
4.5
希望幫到你!