(1)0.125×3/4+1/8×8.25+12.5%=0.125×0.75+0.125×8.25+0.125=0.125×9+0.125=0.125×10=1.25(2)第二个问题实在是看不懂你写的,应该是一个先通分再合并同类项的问题(3)9999×2222+3333×3334=9999×2222+3333×3333+3333=9999×2222+9999×1111+3333=9999×3333+3333=10000×3333=33330000