Question

3.6乘11.1+1.2乘66.7=? 7.2乘14.5+17乘2.8=？ 256乘255分之254加254乘255分之1=？ 简便运算

Answer 1

3.6×11.1+1.2×66.7=1.2×3×11.1+1.2×66.7=1.2×(33.3+66.7)=1.2×100=120
7.2×14.5+17×2.8=(10-2.8)×14.5+17×2.8=145+2.8×(17-14.5)=145+2.8×2.5=145+0.7×4×2.5=145+7=152

第三个是256×254/255+254×1/255么？如果这样，没什么简便运算

Answer 2

256x254/255+254x1/255
=(255+1)x254/255+(255-1)x1/255
=255x254/255+254/255+255x1/255-1/255
=254+254/255+1-1/255
=255+253/255
=255又253/255

Answer 3

3.6×11.1+1.2×66.7=1.2×3×11.1+1.2×66.7=1.2×(33.3+66.7)=1.2×100=120
7.2×14.5+17×2.8=(10-2.8)×14.5+17×2.8=145+2.8×(17-14.5)=145+2.8×2.5=145+0.7×4×2.5=145+7=152
256×255/254+254×1/255你有没有看错啊？怎么会出这么大的分式呢？还没有简便运算