3x-x+5x-6=8 1.9-0.34=3.16+1.2x 2(6-2x) +3(2x-3)=17 15X-2(4-3x)=3415 12.5 +3(2.6X+1.5)=9.6X+2.6是求未知数 .

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3x-x+5x-6=8 1.9-0.34=3.16+1.2x 2(6-2x) +3(2x-3)=17 15X-2(4-3x)=3415 12.5 +3(2.6X+1.5)=9.6X+2.6是求未知数 .
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3x-x+5x-6=8 1.9-0.34=3.16+1.2x 2(6-2x) +3(2x-3)=17 15X-2(4-3x)=3415 12.5 +3(2.6X+1.5)=9.6X+2.6是求未知数 .
3x-x+5x-6=8 1.9-0.34=3.16+1.2x 2(6-2x) +3(2x-3)=17 15X-2(4-3x)=3415 12.5 +3(2.6X+1.5)=9.6X+2.6
是求未知数 .

3x-x+5x-6=8 1.9-0.34=3.16+1.2x 2(6-2x) +3(2x-3)=17 15X-2(4-3x)=3415 12.5 +3(2.6X+1.5)=9.6X+2.6是求未知数 .
3x-x+5x-6=8
7x=8+6
7x=14
x=2
1.9-0.34=3.16+1.2x
1.2x=1.9-0.34-3.16
1.2x=-1.6
x=- 4/3
2(6-2x) +3(2x-3)=17
12-4x+6x-6=17
6x-4x=17+6-12
2x=11
x=5.5
15X-2(4-3x)=3415
15x-8+6x=3415
15x+6x=8+3415
21x=3423
x=163
12.5 +3(2.6X+1.5)=9.6X+2.6
12.5+7.8x+4.5=9.6x+2.6
9.6x-7.8x=2.6-4.5-12.5
1.8x=-14.4
x=-8