求两题简便运算:(1)1149*69-149+149*32 (2)3339+17661/87
问题描述:
求两题简便运算:(1)1149*69-149+149*32 (2)3339+17661/87
答
(1000+149)X69-149+149X32=1000X69+149X(69-1+32)=69000+149X100=21800
求两题简便运算:(1)1149*69-149+149*32 (2)3339+17661/87
(1000+149)X69-149+149X32=1000X69+149X(69-1+32)=69000+149X100=21800