Calcule o valor das expessões:

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}

53-{20-[30-(15-1+6)+2]}

{42+[(45-19)-(18-3)+1]-(28-15)-1}

62-{16-[7-(6-4)+1]}

20-{8+[3+(8-5)-1+6}

15+{25-[2-(8-6)]+2}

56-[3+(8-2)+(51-10)-(7-2)]

1

Respostas

2013-04-16T19:12:43-03:00

1) 25 - ( + 13) = 25 - 13 = 12.

2) 32 + [ 10 - 4 + 8 ] = 32 + 14 = 36.

3) 45 - [8+3] = 45 - 11 = 34.

4) 70 - [ 20 - 6] = 70 - 14 = 56.

5) 28 + [13( 6-5+2) - 1] = 28 + 15 = 43.

6) 53 - [20 - (30 - 20 + 2)] = 53 - [20 - 12] = 53 - 8 =  45.

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