解:200+50+200+25等于( 475 )
∵已知需求出200+50+200+25等于多少
5 × (A + B)= 5 × A + 5 × B
∴200 + 50 + 200 + 25
= 25 × (8 + 2 + 8 + 1)
= 25 × (10 + 8 + 1)
= 25 × (18 + 1)
= 25 × 19
= 475
答:200+50+200+25等于475
=(200+200)+(50+25)
=400+75
=475
分配律是乘法的定律