2(35x)=6.570x = 6.5x=6.5 / 70x≈0.093
解:35x=6.5÷235x=3.25x=3.25÷35x≈0.09
70x=6.5x=6.5/70x=0.093
2(35x)=6.570x = 6.5x=6.5 / 70x=13/140