数学二元一次方程组
问题描述:
数学二元一次方程组
(1)
2x-3y=5,
3x+2y=1;
(2)
3分之x-2y - 2分之x+2y=-1,
5(x-2y)-4(x+2y)=-1;
(3)
2x-5y=2,
4x-11y=2;
(4)
x+1=5(y+2),
3(2x-5)-4(3y+4)=5;
(5)
3分之3x+2y = 3分之5y+12x=-1;
(6)
|3x-2y-3|+(7x+3y-53)²=0
答
(1)2x-3y=5,.1式3x+2y=1; .2式1式*2+2式*3,13x=13 x=11式*3-2式*2,-13y=13 y=-1(2)3分之x-2y - 2分之x+2y=-1,5(x-2y)-4(x+2y)=-1;(x-2y)/3-(x+2y)/2=-1 等式两边*62x-4y-3x-6y=-6x+10y=6 .1式5(x-2y)-4(x+...