Question

Por favor respondem
25 – [10 + (7 – 4)]=
32 + [10 – (9 – 4) + 8]=
45 – [12 – 4 + (2 + 1)] =
70 – {20 – [10 – (5 – 1)]} =
28 + {13 – [6 – (4 + 1) + 2] – 1]} =

Answer 1

Explicação passo-a-passo:

a

25 – [10 + (7 – 4)]=

7 - 4 = 3

25 - [ 10 + 3 ] =

10 + 3 = 13

25 - 13 = 12 >>>>>resposta

b

32 + [10 – (9 – 4) + 8]=

9 - 4 = 5

reescrevendo

32 + [ 10 - 5 + 8 ]

10 - 5 + 8 = + 13 >>

10 - 5 = +5

+5 + 8 = + 13

reescrevendo

32 + 13 = + 45 >>>>> resposta

c

45 – [12 – 4 + (2 + 1)] =

2 + 1 = 3 >>

reescrevendo

45 - [ 12 - 4 + 3 ]

12 - 4 + 3 = + 11

12 - 4 = +8

+8 + 3 = + 11>>>

reescrevendo

45 - 11 = + 34>>>>>resposta

d

70 – {20 – [10 – (5 – 1)]} =

5 - 1 = +4

10 - 4 = +6 >>>>

reescrevendo

70 - { 20 - [ +6 ]} =

70 - { 20 - 6 }

70 - 14 = 56 >>>> resposta

e

28 + {13 – [6 – (4 + 1) + 2] – 1]} =

4 + 1 = 5

reescrevendo

28 + { 13 - [ 6 - 5 + 2 ] - 1 ] }

6 - 5 + 2 = + 3 >>

6 - 5 = +1

+1 + 2 = + 3 >>>

reescrevendo

28 + { 13 - 3 - 1 ] } =

13 -3 - 1 =+ 9

13- 3 =+ 10

+10 - 1 = +9 >>

reescrevendo

28 + 9 = 37 >>>>>resposta

Answer 2

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$\boxed{\begin{array}{l}\sf25-[10+(7-4)]\\\sf=25-[10+3]\\\sf=25-13=12\\\sf32+[10-(9-4)+8]\\\sf=32+[10-5+8]\\\sf=32+13=45\\\sf45-[12-4+(2+1)]\\\sf=45-[12-4+3]\\\sf=45-11=34\\\sf 70-\{20-[10-(5-1)]\}\\\sf=70-\{20-[10-4]\}\\\sf=70-\{20-6\}\\\sf=70-14=56\\\sf 28+\{13-[6-(4+1)+2]-1\}\\\sf=28+\{13-[6-5+2]-1\}\\\sf=28+\{13-3-1\}\\\sf=28+9=37\end{array}}$