Question

7) (10.6+12.4+5.8)-40=

8) [6.(3.4-2.5)-4]+3.(4-2)-(10÷2)=

9) 67+{50.[70÷(27+8)+18÷2]+21}=

10) [30.(9-6)]+{30÷(9+6)]=

11) 58-[20-(3.4-2)÷5]=

12) 40+2.[20-(6+4.7)÷2]=

13) (12+2.5)-8=

14) 25-(15+6÷3)=

15) 25+[7+(8-4÷2)]=

16) 60-[8+(10-2)÷2]=

17) 80-[22+(5.2-1)+6]=

18) 14÷2+[13-(4.2+1)]=

19) [30+2×(5-3)]×2-10=
me ajuda por favor???

Answer 1

7) (10.6 + 12.4 + 5.8 ) - 40 = 
    (60 + 48 + 40) - 40 =
     148 - 40 = 108
8) [6. (3.4 - 2.5) - 4] + 3. (4-2) - (10:2)=
    [6. (12 - 10) - 4] + 3. 2 - 5 =
    [ 6. 2 - 4] + 6 - 5 =
    [ 12 - 4] + 1 =
     8 + 1 = 9
9) 67 + {50.[70:(27+8) + 18:2] + 21 } =
    67 + {50. [70 : 35 + 9] + 21} =
    67 + {50. [2 + 9] + 21 }=
    67 + {50. 11 + 21}
    67 + {550 + 21}=
    67 + 571 =
    638
10) [30. (9-6) ] + {30 : (9+6) }=
      [ 30. 3] + {30 : 15} =
      90 + 2 =
      92
11) 58 - [20 - (3.4 -2) :5]=
      58 - [20 - (12 - 2) : 5] =
      58 - [20 - 10 :5] =
      58 - [20 - 2] =
      58 - 18 =
      40
12) 40 + 2 . [20 - (6+4.7) : 2]=
      40 + 2. [20- (6+28) :2]=
      40 + 2 . [20 - 34 : 2]=
      40 + 2. [20 - 17]=
      40 + 2. 3 =
      40 + 6 =
      46
13) (12+2.5) - 8 =
      (12 + 10) - 8 =
       22 - 8 =
       14
14) 25 - (15+6:3) =
      25 - (15 + 18) =
      25 - 33=
      -8
15) 25 + [7+(8-4:2)]=
      25 + [7 + (8-2)]=
      25 + [ 7 + 6] =
      25 + 13 =
      38
16)60 - [8+(10-2) :2]=
     60 - [8 + 8 : 2]=
     60 - [8 + 4] =
     60 - 12 =
     48
17) 80-[22 + (5.2 -1) + 6] =
      80 - [22 + (10 -1) + 6]=
      80 - [ 22 + 9 + 6 ]=
      80 - [37]=
      80 - 37 =
      43
18) 14:2 + [13-(4.2+1)]=
      7 + [13 - (8+1)]=
      7 + [13 - 9]=
      7 + 4 =
      11
19) [30+2.(5-3)] . 2 - 10=
      [ 30 + 2 . 2] .2 - 10 =
      [ 30 + 4].2 - 10 =
      34 . 2 - 10 =
      68 - 10 =
      58