100 + 100 + 100 + 400 + 300
= 300 + 400 + 300
= 700 + 300
= 1000
100 + 100 + 100 + 400 + 300
= 100 x 3 + 400 + 300
= 300 + 400 + 300
= 700 + 300
= 1000
\(100+100+100+400+300\)
\(=100.3+400+300\)
\(=300+400+300\)
\(=300.2+400\)
\(=600+400\)
\(=1000\)
= 1 x 100 + 1 x 100 + 1 x 100 + 4 x 100 + 3 x 100
= 100 x ( 1+1+1+4+3 )
= 100 x 10
= 1000
Nhớ cho ^-^ !