问题:15道一元一次方程题带解的.快!着急!就是15道一元一次的方程,然后你解出来!自己出题!拜托了!
答案:↓↓↓ 陈春云的回答: 网友采纳 一元一次方程: 1.2(x-2)-3(4x-1)=9(1-x) 4x-4-12x+3=9-9x -8x+9x=9-3+4 x=10 2.11x+64-2x=100-9x 11x-2x+9x=100-64 18x=36 x=2 3.15-(8-5x)=7x+(4-3x) 15-8+5x=7x+4-3x 5x-7x+3x=4-15+8 x=-3 4.3(x-7)-2[9-4(2-x)]=22 3x-21-2(9-8+4x)=22 3x-21-18+16-8x=22 -5x=22+23 -5x=45 x=-9 6.2(x-2)+2=x+1 2x-4+2=x+1 2x-x=1+4-2 x=3 7.0.4(x-0.2)+1.5=0.7x-0.38 0.4x-0.08+1.5=0.7x-0.38 -0.3x=0.08-0.38-1.5 -0.3x=-1.8 x=6 8.30x-10(10-x)=100 30x-100+10x=100 40x=200 x=5 9.4(x+2)=5(x-2) 4x+8=5x-10 x=18 10.120-4(x+5)=25 120-4x-20=25 4x=120-20-25 4x=75 x=18.75 11.15x+863-65x=54 -50x=-863-54 -50x=-917 x=58.64 12.12.3(x-2)+1=x-(2x-1) 12.3x-24.6+1=-x+1 4x=24.6 x=6.15 13.11x+64-2x=100-9x 9x+9x=100-64 18x=36 x=2 14.14.59+x-25.31=0 x-10.72=0 x=10.72 15.x-48.32+78.51=80 x+30.19=80 x=49.81 |