解:45×20再乘六等于( 5400 )
∵已知需求出45×20再乘六等于多少
∴45×20再乘六
= 45 × 20 × 6
= 900 × 6
= (9 × 100)× 6
= 9 × 100 × 6
= 9 × 6 × 100
= 54 × 100
= 5400
答:45×20再乘六等于5400
45×20=900
900×6=5400
45x(20+6)=45x20+45x6=900+270=1170