Question

calcule: a=1000-100+10   b= 1000+100-10  c = 999-99+9

Answer 1

A- 1000-100+10 = 1000-100 = 900+10 = 910
B-  1000+100-10 = 1000+100 = 1100-10 = 1,090
C- 999-99+9 = 999-99 = 900+9 = 909

Espero ter ajudado .

Answer 2

$a)1 \: 000 - 100 + 10 \\ 900 + 10 \\ \color{red}910$

$b)1 \: 000 + 100 - 10 \\ 1 \: 100 - 10 \\ \color{red}1 \: 090$

$c)999 - 99 + 9 \\ 900 + 9 \\ \color{red}909$

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Att, IzabelaCristina2006 ❤️