x-0.25=1/4 解 x=1/4+0.25 x=0.5 x/4=30％解 x=4×30%x=1.24+0.7x=102解 0.7x=102-4x=98/0.7x=1402/3x+1/2x=42解 7/6x=42x=42÷7/6x=363.设要种x棵树苗.98%x=3804.设栽了丁香x棵.2x=240+16x=1285.设共x页.或 设 x-1/...