Question

20+[13+(10-6)+4]
54-{12+[15-(8-4)]}
25+{12+[2-(8-6) +2]}
{[(18-3)+(7+5)-2]+5}-12

Answer 1

Resposta:

a) $41$

b) $53$
c) $39$
d) $18$

Explicação passo a passo:

a) $20+\left[13+\left(10-6\right)+4\right]=20+21=41$

b) $54-12+\left[15-\left(8-4\right)\right]=54-12+11=53$
c) $25+12+\left[2-\left(8-6\right)+2\right]=25+12+2=39$
d) $\left\{\left[\left(18-3\right)+\left(7+5\right)-2\right]+5\right\}-12=30-12=18$