請教一道小學算術題用最簡便的方法 (1+0.23+0.34)X(0.23+0,34+0.65)-(1+0.23+0.34+0.65)X(0.23+0.34)=

請教一道小學算術題用最簡便的方法 (1+0.23+0.34)X(0.23+0,34+0.65)-(1+0.23+0.34+0.65)X(0.23+0.34)=

(1+0.23+0.34)X(0.23+0,34+0.65)=1X(0.23+0.34)+(0.23+0.34)X(0.23+0.34)+1X0.65+(0.23+0.34)X0.65(同時選取公因式(0.23+0.34))=(1+0.23+0.34+0.65)X(0.23+0.34)+0.65從而可以知道(1+0.23+0.34)X(0.23+0,34+0.65)…