Explicación paso a paso:
1)
[tex]( - 7).( - 12 + 4) + 2.( - 3) - 20 \\ - 7( - 8) - 6 - 20 \\ 56 - 6 - 20 \\ 50 - 20 \\ 30[/tex]
2)
[tex]12 - ( - 7).2 + (4) \div 2 \\ 12 + 7(2) + \frac{4}{2} \\ 12 + 14 + 2 \\ 26 + 2 \\ 28[/tex]
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Verified answer
Explicación paso a paso:
1)
[tex]( - 7).( - 12 + 4) + 2.( - 3) - 20 \\ - 7( - 8) - 6 - 20 \\ 56 - 6 - 20 \\ 50 - 20 \\ 30[/tex]
2)
[tex]12 - ( - 7).2 + (4) \div 2 \\ 12 + 7(2) + \frac{4}{2} \\ 12 + 14 + 2 \\ 26 + 2 \\ 28[/tex]