Problema de matematica

1) a) [pic]

b) [pic]

c) [pic]

d) [pic]

e) [pic]

f)[pic]

g) [pic]
2) [pic]
a) [pic]
b) [pic]
c) [pic]
d) [pic]
e) [pic]

3) (375∙2/5)=750/5=150
150-6=144
375-144=231

(231∙1/3)=231/3=77
77+18=95
375-144-95=136

4) (-3)[pic].[-9 + (-3)[pic]]:(-3)[pic] = [pic]

5) 4X + 2Y = 8,96 4X =8,96 – 2Y
X = [pic]
2X + 3Y = 9,48
[pic]

2x + 4x + x = 42
7x = 42 x = 42/6 x = 6

Flavio Recebe 6
Ana recebe 6.2 = 12
Aldenir recebe 12.2 = 24

a) X= [pic]

b) 3n = 7 + 17 n= [pic] n=8

c) 4y = y – 10 -12 4y = y – 22 4y – y = 22 y = [pic] d) 3(2x-1)+6x = 4-(+8) 6x - 3 = 4 – 6 + 6x 6x – 6x = -1 [pic]
16 - 3x = 2x + 41
-3x -2x = 41-16
-5x = 25
X=25/-5
X= -5

9) 3 - 2x = 5.(x-11)
3 - 2x = 5x – 55
-2x – 5x = -58
-7x = -58
X = 58/7
X = 8,28

ficam entre 8 e 9 inteiros

x + (x + 140) = 580
2x + 140 = 580
2x = 580 – 140
X = 440 / 2
X = 220

X +140
220 + 140 = 360

Caixa1=220
Caixa2=360
220 + 360 = 580
11)
[pic] [pic] 8 x X = 3240 / 35 = 92,57

60=30
80 = x
60/80 = x/30
80x = 30.60
X = 1800 / 80
X =22,5

13) 15 600 40 x

15 x =24000
X = 24000 / 15
X = 1600

14) 24,5 28 X 54
28 X = 1323
X = 1323 / 28
X = 47,25