谁能给20题二元一次方程组的计算题~`答:10x-8y=14,x+y=5 4x+7y=3,x+y=0 3x+y=10,7x-y=20 44x+10y=27,x+y=1 8x-y=0,x+y=18 11x-y=12,11y-x=-12 5x+6y=27,2x+3y=12 7x-2y=4,x+2y=12 (2x+y)-5y=2,2x-5y=0 7x-3y=3,3x+2y=21 7x+2y=21,y-6x=1 10x-8y=0,3x-2y=2 3x+y=10,5x-7y=8 ...
求20道二元一次方程组(计算题),要简单的答:1)14,x-y=8,xy=9 (x=9,y=1)15,x+y=4,x-y=2 (x=3,y=1)16,x+y=3,xy=0 (x=0,3,y=3,0)17,x-y=5,xy=6 (x=6,y=1)18,y-x=3,xy=28 (x=4,y=7)19,y-x=2,xy=24 (x=4,y=6)20,x+y=9,x-y=1, (x=5,y=4)那不是小数点,是逗号,有2组解 ...