谁帮我解一下这个方程

显示全部楼层 · 2011-2-12 17:58:13

0.18x+0.18*30+0.16x+0.2*70-0.4x=18.8(0.18+0.16-0.4)x=18.8-0.18*30-0.2*70-0.06x=18.8-5.4-14-0.06x=-0.6x=10...

千问 · 2011-2-12 17:58:13

0.18(x+30)+0.16x+0.2*(70-2x)=18.80.18x+0.18*30+0.16x+14-0.4x=18.80.18x+0.16x-0.4x+0.18*30+14=18.8(0.34-4)x=18.8-14-0.18*30-0.06x=4.8-5.4=-0.6x=10...

千问 · 2011-2-12 17:58:13

0.18(x+30)+0.16x+0.2*(70-2x)=18.80.18x+5.4+0.16x+14-0.4x=18.8(0.18+0.16-0.4)x=18.8-5.4-14-0.06x=-0.6x=10...

千问 · 2011-2-12 17:58:13

0.18(x+30)+0.16x+0.2*(70-2x)=18.8两边通乘50得9（x+30)+8x+10(70-2x)=9409x+270+8x+700-20x=940-3x=-30x=10...

千问 · 2011-2-12 17:58:13

0.18x+5.4+0.16x+14-0.4x=18.80.06x=0.6x=10...