MATEMÁTICA 7ºA e B

DATA: 01/06/2020

CORREÇÃO DAS ATIVIDADES DO LIVRO DIDÁTICO DA PÁGINA: 58, NÚMEROS: 8, 9, 10 

COPIE  E RESPONDA NO CADERNO - COLOQUE DATA

1) 

a) 35 + [– 21 – ( – 12 + 15)]          35 + [– 21 – (+ 3)]            35 + [ – 21 – 3]               35 + [– 24]                  35 – 24                     + 11	b) – 20 – [21 + (– 20 – 16) + 11]         – 20 – [21 + (– 36) + 11]              – 20 – [21 – 36 + 11]              – 20 – [–15 + 11]                  – 20 – [– 4]                     – 20 + 4                       – 16
c) 20 – (16 + 17) – [15 – (18 – 23)]          20 – (+ 33) – [15 – (– 5)]              20 – 33 – [15 + 5]                 – 13 – [+20]                   – 13 – 20                        – 33	d) – (– 30) – [37 + (35 – 31 – 34) – 36]          + 30 – [37 + (+ 4 – 34) – 36]              + 30 – [37 + (– 30) – 36]                 + 30 – [37 – 30 – 36]                    + 30 – [+ 7 – 36]                       + 30 – [– 29]                           + 30 + 29                                 + 59

9)

A) – 300 + 300               0	B) – 1 – 1 + 1 –  1          – 2 + 0              – 2
C) – 25 + 3 + 25      – 25 + 25 + 3           0 + 3            + 3	D) – 2 + 10 + 2 – 10       – 2 + 2  + 10 – 10             0 + 0                0

SOMA DE NÚMEROS OPOSTOS = 0

10)