las comencé a escribir desde la solución
4. -1[+42÷7+1]+19
=-18+19
=1
5. -(-[+21÷3]+2)-1
= -(-7+2)-1
= 5-1
= 4
6. [-4•7-35] +11
= -63+11
= -52
7. 24-[8+2+2]
= 24-12
=12
8. 5-90÷[4-19+26]
= 5-55÷11
= 0
9. 8+[7+1+67]÷ 15
= 8+75÷15
=13
10. 48÷[-6+12]+18
= 48÷6+18
= 26
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las comencé a escribir desde la solución
4. -1[+42÷7+1]+19
=-18+19
=1
5. -(-[+21÷3]+2)-1
= -(-7+2)-1
= 5-1
= 4
6. [-4•7-35] +11
= -63+11
= -52
7. 24-[8+2+2]
= 24-12
=12
8. 5-90÷[4-19+26]
= 5-55÷11
= 0
9. 8+[7+1+67]÷ 15
= 8+75÷15
=13
10. 48÷[-6+12]+18
= 48÷6+18
= 26