Question

Tính ttoorrng :

a) (-17) + 5 + 8 + 17;

b) 30 + 12 + (-20) + (-12)

c) (-4) + (-440) + (-6) + 440;

d) (-5) + (-10) + 16 + (-1)

Answer 1

a) (-17) + 5 + 8 + 17 = [ ( - 17 ) + 17 ] + 5 + 8 = 0 + 5 + 8 = 13

b) 30 + 12 + (-20) + (-12) = [ - 12 + 12 ] + 30 + ( - 20 ) = 0 + 10 = 10

c) (-4) + (-440) + (-6) + 440 = [ 440 + ( - 440 ) ] + ( - 4 ) + (- 6 ) = 0 = ( -10 ) = -10

d) (-5) + (-10) + 16 + (-1) =[ (-5) + (-10) + 16 ] + ( -1 ) = 0 + ( -1 ) = -1

Answer 2

a) (-17) + 5 + 8 + 17 = [ ( - 17 ) + 17 ] + 5 + 8 = 0 + 5 + 8 = 13

b) 30 + 12 + (-20) + (-12) = [ - 12 + 12 ] + 30 + ( - 20 ) = 0 + 10 = 10

c) (-4) + (-440) + (-6) + 440 = [ 440 + ( - 440 ) ] + ( - 4 ) + (- 6 ) = 0 = ( -10 ) = -10

d) (-5) + (-10) + 16 + (-1) =[ (-5) + (-10) + 16 ] + ( -1 ) = 0 + ( -1 ) = -1

Answer 3

a) (-17) + 5 + 8 + 17= [ -17+17 ] + 5 + 8 = 0 + 5 + 8 = 13
b) 30 + 12 + (-20) + (-12) = 30 + [ 12 + ( -12 ) ] + ( -20 ) = 30 + 0 + ( -20 ) = 1
c) (-4) + (-440) + (-6) + 440= [ -440 + 440 ] + [ -4 + ( -6 ) ] = 0 + ( -10) = -10
d) (-5) + (-10) + 16 + (-1) = -15 + 16 +( -1 ) = 1 +(-1) = 0
        nhé♥♥ Chúc bạn học tốt

Answer 4

\(a.\text{(-17) + 5 + 8 + 17}\)                            \(b.\text{30 + 12 + (–20) + (–12)}\)

\(=\text{(–17) + 17}\text{+ 5 + 8}\)                        \(\text{= 30 + 12 – 20 – 12}\)

\(=\text{0 + 5 + 8}=5+8=13\)          \(\text{= (30 – 20) + (12 – 12)}\)

                                                                      \(\text{= 10 + 0 = 10}\)

\(c.\text{(–4) + (–440) + (–6) + 440}\)          \(d.\text{(–5) + (–10) + 16 + (–1)}\)

\(\text{= [(–4) + (–6)] + [(–440) + 440]}\)\(\text{= 16 + (–5) + (–10) + (–1)}\)

\(\text{= [– (4 + 6)] + 0}\)                               \(\text{= 16 – (5 + 10 + 1)}\)

\(\text{= –10 + 0 = –10}\)                               \(\text{= 16 – 16 = 0}\) 

Quy tắc dấu ngoặc ( SGK )

Answer 5

Đoạn c bằng 10 nhé. Mik bị lỗi chút

Answer 6

cho mik nha