100 + 200 + 300 + 400 - 500 - 10.
= 300 + 300 + 400 - 500 - 10.
= 600 + 400 - 500 - 10.
= 1000 - 500 - 10.
= 500 - 10.
= 490.
Kích tui nha!!!
100 + 200 + 300 + 400 - 500 - 10 = 490
Happy new year Phạm Thị Ánh Dương !!!
\(100+200+300+400-500-10\)
\(=300+300+400-500-10\)
\(=1000-500-10\)
\(=500-10\)
\(=490\)
100 + 200 + 300 + 400 - 500 - 10
= (1+ 2 + 3 + 4 - 5 - 1 ) x 10
= (10 - 5 - 1 ) x 10
= 4 x 10
= 40