2x+2y=6,3x+4y=160.5x+0.8y=4.7,0.6x+1.2y=6.67(5x+4y/5=4,(4x+7y)=8.4x/3+y/4=1/2 ,7x+4y=-15 3IXI+2Y=9,4IXI-5Y=35 “I”表示绝对值
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![2x+2y=6,3x+4y=160.5x+0.8y=4.7,0.6x+1.2y=6.67(5x+4y/5=4,(4x+7y)=8.4x/3+y/4=1/2 ,7x+4y=-15 3IXI+2Y=9,4IXI-5Y=35 “I”表示绝对值](/uploads/image/z/3698625-57-5.jpg?t=2x%2B2y%3D6%2C3x%2B4y%3D160.5x%2B0.8y%3D4.7%2C0.6x%2B1.2y%3D6.67%EF%BC%885x%2B4y%2F5%3D4%2C%EF%BC%884x%2B7y%EF%BC%89%3D8.4x%2F3%2By%2F4%3D1%2F2+%2C7x%2B4y%3D-15+3IXI%2B2Y%3D9%2C4IXI-5Y%3D35+%E2%80%9CI%E2%80%9D%E8%A1%A8%E7%A4%BA%E7%BB%9D%E5%AF%B9%E5%80%BC)
2x+2y=6,3x+4y=160.5x+0.8y=4.7,0.6x+1.2y=6.67(5x+4y/5=4,(4x+7y)=8.4x/3+y/4=1/2 ,7x+4y=-15 3IXI+2Y=9,4IXI-5Y=35 “I”表示绝对值
2x+2y=6,3x+4y=16
0.5x+0.8y=4.7,0.6x+1.2y=6.6
7(5x+4y/5=4,(4x+7y)=8.4
x/3+y/4=1/2 ,7x+4y=-15
3IXI+2Y=9,4IXI-5Y=35 “I”表示绝对值
2x+2y=6,3x+4y=160.5x+0.8y=4.7,0.6x+1.2y=6.67(5x+4y/5=4,(4x+7y)=8.4x/3+y/4=1/2 ,7x+4y=-15 3IXI+2Y=9,4IXI-5Y=35 “I”表示绝对值
2x+2y=6--1式,3x+4y=16----2式
1式*2-2式
4x-3x=4y-4y=12-16
x=-4
y=7
(2):0.5x+0.8y=4.7→x+1.6y=8 ①
0.6x+1.2y=6.6→x+2y=11 ②
②-①得,0.4y=3,y=7.5,带入①式得,x=-4
(3):请写清楚
(4):x/3+y/4=1/2 ---1,7x+4y=-15----2
1式*12
4x+3y=6 ----3式
2式*3---->21x+12y=-45
1式*4---->16x+12y=24
两式相减
5x=-69
余下就自己算吧
2x+2y=6→x+y=3→3x+3y=9 ①
3x+4y=16 ②
② -①,得y=7,代入 ①式得,x=-4
0.5x+0.8y=4.7→x+1.6y=8 ①
0.6x+1.2y=6.6→x+2y=11 ②
②-①得,0.4y=3,y=7.5,带入①式得,x=-4