A ) 3 + 7 - 2 ÷ 7 × 6

B ) 7 × 9 ÷ 10 + 23 - 1

C ) - 40 + 30 - 2 × 3 ÷ 20

D ) 5 + 20 × 10 ÷ 30 + 24

Para agora por favor !
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