解方程 ①1/5(x-8)+1/4x+x-1/7=6-23-x/5 ②3(0.7x+0.1)+2(0.25x-0.2)=5.1 ③(1.2+x)/0.4-(0.5x+1)/0.7=1_作业帮
解方程 ①1/5(x-8)+1/4x+x-1/7=6-23-x/5 ②3(0.7x+0.1)+2(0.25x-0.2)=5.1 ③(1.2+x)/0.4-(0.5x+1)/0.7=1
解方程 ①1/5(x-8)+1/4x+x-1/7=6-23-x/5 ②3(0.7x+0.1)+2(0.25x-0.2)=5.1 ③(1.2+x)/0.4-(0.5x+1)/0.7=1
①1/5(x-8)+1/4x+x-1/7=6-23-x/5 28﹙x-8﹚+35x+20﹙x-1﹚=840-28﹙23-x﹚28x-224+35x+20x-20=840-644+28x55x=440∴x=8②3(0.7x+0.1)+2(0.25x-0.2)=5.12.1x+0.3+0.5x-0.4=5.12.6x=5.2∴x=2③(1.2+x)/0.4-(0.5x+1)/0.7=17﹙1.2+x﹚-4﹙0.5x+1﹚=2.88.4+7x-2x-4=2.85x=﹣1.6∴x=﹣0.32
①1/5(x-8)+1/4x+x-1/7=6-23-x/5 28﹙x-8﹚+35x+20﹙x-1﹚=840-28﹙23-x﹚28x-224+35x+20x-20=840-644+28x55x=440∴x=8②3(0.7x+0.1)+2(0.25x-0.2)=5.12.1x+0.3+0.5x-0.4=5.12.6x=5.2