數學方程~

１）4(3-x)-5(x-4)=3(5-x)-7
12-4x-5x+20=15-3x-7
-9x+32=8-3x
24=6x
x=4
２）(x-1)/3 + (x+1)/4=1/6
12*(x-1)/3+12*(x+1)/4=12*1/6
4x-4+3x+3=2
7x-1=2
x=3/7

2) (x-1)/3+(x+1)/4=1/6
4x-4+3x+3=2
3=7x
1/7 =x

1）4(3-x)-5(x-4)=3(5-x)-7
12-4x-5x+20=15-3x-7
12+20-4x-5x=15-7-3x
32-9x=8-3x
32-8=9x-3x
24=6x
24/6=x
x=4

2) (x-1)/3 + (x+1)/4=1/6
4【(x-1)/3】+ 3【(x+1)/4】=1/6
4(x-1)/12+3(x-1)/12 =1/6
4x-4+3x+3/12 =1/6
4x+3x-4+3 =(1/6)(12)
7x-1=2
7x=2+1
x=3/7

1) 4(3-x)-5(x-4)=3(5-x)-7
12-4x-5x+20=15-3x-7
12-15+7+20=-3x+4x+5x
24=6x
x=4

2) (x-1)/3+(x+1)/4=1/6
4x-4+3x+3=2
4x+3x=2-3+4
7x=3
x=1/7

1) 12-4X-5X+20=15-3X-7
32-9x=8-3x
24=6x
x=4

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

1)
4(3-x)-5(x-4)=3(5-x)-7
12-4x-5x-20=15-3x-7
12-20-4x-5x=15-7-3x
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