Question

1 3x2-y=0;②=1;③2xy-7=0;④3x=x2+4;⑤+5=;⑥(a-1)x2-x=6

帮我解五道方程,写得好加100悬赏分,我有600悬赏分~说到做到~（今天1：30之前）
①（x+y)/6+(x-y)/10=3,(x-3)/4-(y-3)/3=35/6..②(x+1)/3-(y+2)/4=0,(x-3)/4-(y-2)/3=1/12.③x/3+y/2=1/2,5x+7y=6又5/6.④5x-2y=50,15%x+6%y=5.⑤(2x-y)/2+1=(x-y)/3,2x-3y=4

Answer 1

①（x+y)/6+(x-y)/10=3则4x+y=45
(x-3)/4-(y-3)/3=35/6,则3x-4y=67
两式联立,得x=13,y=-7
②(x+1)/3-(y+2)/4=0,则4x-3y=2
(x-3)/4-(y-2)/3=1/12,则3x-4y=2
两式联立,解得x=2/7,y=-2/7
③x/3+y/2=1/2,则2x+3y=3
5x+7y=6又5/6,则30x+42y=41
两式联立,解得x=-1/2,y=4/3
④5x-2y=50,
15%x+6%y=5,则15x+6y=500
两式联立,解得x=65/3,y=175/6
⑤(2x-y)/2+1=(x-y)/3,则4x-y=-6
2x-3y=4
两式联立,解得x=-11/5,y=-14/5