2.1x+x=25.73解:3.1x=25.73x=8.3
3.1x=54.2 x=17.483871
2.1*+*=25.73解:3.1*=25.73*=25.73÷3.1*=8.3检验:2.1*8.3+8.3=17.43+8.3=25.73
解:合并同类项得3.1x=6.82方程两边同时除以3.1得x=2.2
解:依题意得方程,2.1+x=25.73x=25.73-2.1x=23.63即2.1+x=25.73的解是x=23.63
2.1x-x=25.73,x=23+43/110.
x+2.1x=1.553.1x=1.55x=1.55/3.1x=0.5
x=8.2
嗯…X看成1X!然后3.1X=54.2然后X等于54.2除于3.1(x=17.384871)
2.1x-11=x+111.1x=22x=20