24比8比12化簡
簡便算:75×64-64×65
(75-65)*64=10*64=640
19.75×35+64×19.75+19.75,簡算
提公因式,選取19.75,得:19.75*(35+64+1)=19.75*100=1975
35×24+24×65(簡算)
急
35×24+24×65
=24×(35 + 65)
=24×100
=2400