775÷25×32=31×25÷25×32=31×32149+37×23=149+(30+7)×(20+3)=149+20×30+30×3+7×20+7×3=149+600+90+140+21=149+21+600+90+40=170+600+90+40169+259+135=169+135+259=169+131+3+1+259=300+3+260243-(43+62)=...