①1.2x+0.8=0.8x-2/5-1/5x 1.2x-0.8x+1/5x=-2/5-0.8 1.2x-0.8x+0.2x=-0.4-0.8 0.6x=-1.2 x=-2 ②2.5y+1=-5.5y+15 2.5y+5.5y=15-1 8y=14 y=7/6 ③2/5x-4=12+3/5x 3/5x-2/5x=-4-12 1/5x=-16 x=-80
麻烦采纳,谢谢!
①1.2x+0.8=0.8x-2/5-1/5x 1.2x-0.8x+1/5x=-2/5-0.8 1.2x-0.8x+0.2x=-0.4-0.8 0.6x=-1.2 x=-2 ②2.5y+1=-5.5y+15 2.5y+5.5y=15-1 8y=14 y=7/6 ③2/5x-4=12+3/5x 3/5x-2/5x=-4-12 1/5x=-16 x=-80
麻烦采纳,谢谢!