Question

(✿^‿^) responda se quiser MAIS SE COLAR DA INTERNET COLA DIREITO POXAA​

Answer 1

Explicação passo-a-passo:

A

$81 + ( - 20) \times( + 4) \\ - 20 \times 4 = - (20 \times 4) = - 80 \\ 81 - 80 \\ 1$

B

$( - 4) \times ( - 7) - 30 \\ ( - 4) \times ( - 7) = 4 \times 7 = 28 \\ 28 - 30 \\ - 2$

C

$- 23 - ( - 6) \times ( + 3) \\ - 23 + 6 \times 3 \\ 6 \times 3 = 18 \\ - 23 + 18 \\ - (23 - 18) \\ - 5$

D

$( - 9 ) \cdot ( + 6 ) - ( + 2 ) \cdot ( - 27 ) \\ -54-2\left(-27\right) \\ -54-\left(-54\right) \\ -54+54 \\ 0$

E

$19--4 \cdot 5 \\ 19-\left(-20\right) \\ 19+20 \\ 39$

F

$7 \times ( - 3 ) - 9 \times ( - 6 ) + 11 \times ( - 2 ) \\ -21-9\left(-6\right)+11\left(-2\right) \\ -21-\left(-54\right)+11\left(-2\right) \\ -21+54+11\left(-2\right) \\ 33+11\left(-2\right) \\ 33-22 \\ 11$

G

$(+5) \times (+11)-37-(-2) \times (+14) \\ 55-37-\left(-2\times 14\right) \\ 18-\left(-2\times 14\right) \\ 18-\left(-28\right) \\ 18+28 \\ 46$

H

$18-3 \times (-7)+9 \times (-4)-20 \\18-\left(-21\right)+9\left(-4\right)-20 \\ 18+21+9\left(-4\right)-20 \\ 39+9\left(-4\right)-20 \\ 39-36-20 \\ 3-20 \\ -17$