7/15-7/15x34/35=7/15*(1-34/35)=7/15*1/35=1/15*1/5 (7与35约分得）=1/753.5÷4+360×25%+0.25×36.5=35/40+360/4+36.5/4=35/40+90+365/40=(35+365)/40+90=400/40+90=10+90=100