數學唔識~F1 數~

1. 4[3x+(x-1)]=x+11
4( 3x + x - 1 ) = x + 11
4( 4x - 1 ) = x + 11
16x - 4 = x + 11
15x = 15
x = 1 //

2. 2[5x-(2x-1)]=7x
2( 5x - 2x + 1 ) = 7x
2( 3x + 1 ) = 7x
6x + 2 = 7x
x = 2 //

3. 4(2x-3)=7(x-1)
8x - 12 = 7x - 7
x = -7 + 12
x = 5 //

2007-03-02 16:51:07 補充：
詳細解釋:1. 4[3x+(x-1)]=x+114( 3x + x - 1 ) = x + 11.............消除左邊的括號4( 4x - 1 ) = x + 11...................將括號內的數simplify16x - 4 = x + 11.......................再將左邊d數expand15x = 15................................. 兩邊同時減 x 和 加 4x = 1 //....................................計出答案

2007-03-02 16:52:22 補充：
2. 2[5x-(2x-1)]=7x2( 5x - 2x + 1 ) = 7x.............消除左邊的括號2( 3x + 1 ) = 7x...................將括號內的數simplify6x + 2 = 7x.......................再將左邊d數expandx = 2 //..............................兩邊同時減 6x, 並計出答案

2007-03-02 16:53:32 補充：
3. 4(2x-3)=7(x-1) 8x - 12 = 7x - 7.......................將左右兩邊d數expandx = -7 + 12..............................兩邊同時減 7x,和加 12x = 5 // ....................................計出答案

1. 4[3x+(x-1)]=x+11
4[3x+x-1]=x+11
4[4x-1]=x+11
16x-4=x+11
15x=15
x=1

2. 2[5x-(2x-1)]=7x
2[5x-2x+1]=7x
2[3x+1]=7x
6x+2=7x
-x=-2
x=2

3. 4(2x-3)=7(x-1)
8x-12=7x-7
8x-7x=-7+12
x=5

1. 4[3x+(x-1)]=x+11
4( 3x + x - 1 ) = x + 11
4( 4x - 1 ) = x + 11
16x - 4 = x + 11
15x = 15
x = 1 //

2. 2[5x-(2x-1)]=7x
2( 5x - 2x + 1 ) = 7x
2( 3x + 1 ) = 7x
6x + 2 = 7x
x = 2 //

3. 4(2x-3)=7(x-1)
8x - 12 = 7x - 7
x = -7 + 12
x = 5 //

1. 4[3x+(x-1)]=x+11
4[3x+x-1]=x+11
4(4x-1)=x+11
16x-4=x+11
16x-x=11+4
15x=15
x=1

2. 2[5x-(2x-1)]=7x
2[5x-2x+1]=7x
2(3x+1)=7x
6x+2=7x
2=7x-6x
x=2

3. 4(2x-3)=7(x-1)
8x-12=7x-7
8x-7x=-7+12
x=5

希望我可以幫到你

4[3x+(x-1)]=x+11
4(3x+x-1)=x+11
4(4x+1)=x+11
16x+4=x+11
16x-x=11-4
15x=7
x=7/15

2[5x-(2x-1)]=7x
2(5x-2x+1)=7x
2(3x+1)=7x
6x+2=7x
2=x
4(2x-3)=7(x-1)
8x-12=7x-7
8x-7x=-7+12
x=5

1.4[3x+(x-1)]=x+11
12x+4x-4=x+11
16X=X+15
15X=15
x=1

2.2[5x-(2x-1)]=7x
10x-4x+2=7x
6X+2=7x
x=2

3.4(2x-3)=7(x-1)
8x-12=7x-7
x=5

1. 4[3x+(x-1)]=x+11
4(4x-1)= x+11
16x-4= x+11
15x= 15
x= 1

2. 2[5x-(2x-1)]=7x
2(5x-2x+1) = 7x
2(3x+1) = 7x
6x+2 = 7x
x = 2

3. 4(2x-3)=7(x-1)
8x-12= 7x-7
x = 5

4[3x+(x-1)]=x+11
4(3x+x-1)=x+11
4(4x+1)=x+11
16x+4=x+11
16x-x=11-4
15x=7
x=7/15

2[5x-(2x-1)]=7x
2(5x-2x+1)=7x
2(3x+1)=7x
6x+2=7x
2=x
4(2x-3)=7(x-1)
8x-12=7x-7
8x-7x=-7+12
x=5

1. 4[3x+(x-1)]=x+11
4(3x+x-1)=x+11
12x+4x-4=x+11
12x+4x-x=11+4
15x=15
x=1

2. 2[5x-(2x-1)]=7x
2(5x-2x+1)=7x
10x-4x+1=7x
1=7x+4x-10x
1=x
x=1

3. 4(2x-3)=7(x-1)
8x-12=7x-7
x=5



2007-03-01 21:32:04 補充：
2. 2[5x-(2x-1)]=7x2(5x-2x 1)=7x10x-4x 2=7x2=7x 4x-10x2=xx=2