Help Me!!!送20點

１）試運甪 1, -2, 3, -4組合出兩條結果為 24 的算式。
Answer: [(-2) - 1 - 3] x (-4) = -6 x -4 = 24
Answer: 1 x (-2) x 3 x (-4) = 24

２ａ）-4a + 9a + 5b - 3b
Answer: 5a + 2b

２ｂ）6x - 7 - (4x + 5)
Answer: 2x - 2

３ａ)（2a）x (-3a)
Answer: -6a²

３ｂ）(-6x)除(-2x)
Answer: 3

2007-08-29 10:53:38 補充：
Answer to 2b should be 2x - 12

2007-08-29 10:54:30 補充：
6x - 7 - (4x 5)= 6x - 7 - 4x - 5= 2x - 12

１）試運甪 1, -2, 3, -4組合出兩條結果為 24 的算式。
＝ [(-2) - 1 - 3] x (-4) = -6 x -4 = 24
＝ 1 x (-2) x 3 x (-4) = 24

２ａ）-4a + 9a + 5b - 3b＝ 5a + 2b

２ｂ）6x - 7 - (4x + 5)＝ 2x - 2

３ａ)（2a）x (-3a)＝-6a²

３ｂ）(-6x)除(-2x) ＝ 3

2a) +5a+2b
2b) +2x-13

3a) -6a^2
3b) 3

1)
(-4) x 1 x (-2) x 3
( 1 + 3 - (-2) ) x 4

2a.) -4a + 9a + 5b - 3b
= 9a - 4a + 5b - 3b
= 5a + 2b

2b.) 6x - 7 - ( 4x + 5 )
= 6x - 7 - 4x - 5
=2x - 12

3a.) ( 2a ) x ( 3a )
= 6a^2

3b.) ( -6x ) / ( -2x )
= 6x / 2x
= 6 / 2
= 3

1. -2 x -4 x 3 x 1 = 24

2a. 5A + 2B

2b. 2X - 12

3a. -6a 2忄

3b. 3

１）　(3 x -4)(1 x -2)
= -12 x -2
= 24

(1 x -4)(-2 x 3)
= -4 x -6
= 24

２ａ） -4a + 9a + 5b - 3b
= 5a + 2b

２ｂ）6x - 7 - (4x + 5)
=6x - 7 - 4x - 5
=2x - 12
=x-6

３ａ)（2a）x (-3a)
=6a^2

３ｂ）(-6x)除(-2x)
=3

1)
1*-2*3*-4
= -2*3*-4
= -6*-4
= 24

2a.
-4a+9a+5b-3b
= 5a-2b

2b.
6x - 7 - (4x+5)
= 6x - 7 - 4x - 5
= 2x - 12

1)
1*-2*3*-4
= -2*3*-4
= -6*-4
= 24

2a.
-4a+9a+5b-3b
= 5a-2b

2b.
6x - 7 - (4x+5)
= 6x - 7 - 4x - 5
= 2x - 12

3a.
2a*-3a
= -6a^2

3b..
-6x/-2x
= 3
2a*-3a
= -6a^2

3b..
-6x/-2x
= 3

１）試運甪 1, -2, 3, -4組合出兩條結果為 24 的算式。
=(-4--2+1)+3