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
(1)1149*69-149+149*32 =(1000+149)*69-149+149*32 =1000*69+149*69-149+149*32 =69000+149*(69-1+32) =69000+149*100 =69000+14900 =83900 (2)3339+17661/87 =3339+203 =3339+200+3 =3542
答
(1000+149)X69-149+149X32=1000X69+149X(69-1+32)=69000+149X100=21800