解二元一次方程
a²-7a+6=0,8x²+6x-35=0,18x²-21x+5=0,20-9y-20y²=0,2x²+3x+1=0,2...
a²-7a+6=0 ,8x²+6x-35=0, 18x²-21x+5=0, 20-9y-20y²=0, 2x²+3x+1=0, 2y+y-6=0,
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a²-7a+6=0
(a-6)(a-1)=0
a=6 a=1
8x²+6x-35=0
(4x-7)(2x+5)=0
x=7/4 x=-5/2
18x²-21x+5=0
(3x-1)(6x-5)=0
x=1/3 x=5/6
20-9y-20y²=0
20y²+9y-20=0
(5y-4)(4y+5)=0
y=4/5 y=-5/4
2x²+3x+1=0
(2x+1)(x+1)=0
x=-1/2 x=-1
2y²+y-6=0
(2y-3)(y+2)=0
y=3/2 y=-2
(a-6)(a-1)=0
a=6 a=1
8x²+6x-35=0
(4x-7)(2x+5)=0
x=7/4 x=-5/2
18x²-21x+5=0
(3x-1)(6x-5)=0
x=1/3 x=5/6
20-9y-20y²=0
20y²+9y-20=0
(5y-4)(4y+5)=0
y=4/5 y=-5/4
2x²+3x+1=0
(2x+1)(x+1)=0
x=-1/2 x=-1
2y²+y-6=0
(2y-3)(y+2)=0
y=3/2 y=-2
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