a. (4578+5422) + (7895+2105)
= 1000 + 1000
= 2000
b. (3012+6988) + (5422+4538)
= 10000 + 1000
= 2000
Học tốt nhé
a, 4578 + 7895 + 5422 + 2105
= ( 4578 + 54 22 ) + ( 7895 +2105 )
= 10 000 + 10 000
= 20 000
b, 5462 + 3012 + 6988 + 4538
= ( 5462 + 4538 ) + ( 3012 + 6988 )
= 10 000 + 10 000
= 20 000
a) 4578 + 7895 + 5422 + 2105
= ( 4578 + 5422 ) + ( 7895 + 2105 )
= 10000 + 10000
= 20000
b) 5462 + 3012 + 6988 + 4538
= ( 5462 + 4538 ) + ( 3012 + 6988 )
= 10000 +10000
= 20000
a) 4578 + 7895 + 5422 + 2105
= ( 4578 + 5422 ) + ( 7895 + 2105 )
= 10000 + 10000
= 20000
b) 5462 + 3012 + 6988 + 4538
= ( 5462 + 4538 ) + ( 6988 + 3012 )
= 10000 + 10000
= 20000