I) 5 - {+3- [(+2)² -(-5)²+ 6 - 4 ]}=
j)15 - { -3 + [(5 - 6)². ( 9-8) ² + 1]}
k)18- { 6 - [ -3 -(5-4) -(7-9)³-1}
l) -2 + { -5-[ -2 -(-2)³- 3 -(3 -2)elevado a nove]+5}
m)4-{(-2)².(-3) -1 [-11 +(-3).(-4)] - (-1)}=
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