(125+25)*8的简便算法

问题描述:

(125+25)*8的简便算法

根据乘法分配律,有(a+b)c=ac+bc
(125+25)×8=125×8+25×4×2=1000+200=1200

1、=150*8=(100+50)*8=100*8+50*8=800+10*5*8=800+10*40=800+400=1200
2、=(100+25+25)*4*2=100*4*2+25*4*2+25*4*2=400*2+100*2+100*2=800+200+200=1200

(125+25)*8
=150*8
=(100+50)*8
=100*8+50*8
=800+400
=1200

8*125+8*25

125*8+25*8

(125+25)*8
=(100+25+25)*8
=100*8+(25+25)*8
=800+400
=1200

(125+25)×8
=125×8+25×8
=1000+200
=1200

(125+25)×8=125×8+25×8
125×8=1000
25×8=25×4×2=200
或者
(125+25)*8=15*8*10=(10+5)*8*10=1200