0.999*0.6+0.111*3.6=0.999*0.6+0.111*6*0.6=0.333*3*0.6+0.222*3*0.6=(0.333+0.222)*3.*0.6=0.555*1.8=0.999 0.52*25/2.6=0.52*25*(1/2.6)=0.52*(1/2.6)*25=0.2*25=517.5*7/2.5 =35/2*7÷(5/2)=35/2*(2/5)*7=7*7=49 希望采纳哦 我打了好久;。,
五年级上册简便计算