numéros racionais e irracionais 7ªano

EXERCÍCIOS

1) Efetue as adições:

a) (+3/5) + (+1/2) = (R: 11/10)
b) (-2/3) + (+5/4) = (R: 7/12)
c) (-4/9) + (+2/3) = (R: 2/9)
d) (-3/7) + (+2/9) = (R: -13/63)
e) (-1/8) + (-7/8) = (R: -1)
f) (-1/3) + (-1/5) = (R: -8/15)
g) (-1/8) + (5/4) = (R: 9/8)
h) (+1/5) + ( +3/5) = (R: 4/5)

2) Efetue as adições:

a) (-2/5) + 3 = (R: 13/5)
b) (-1/6) + (+2) = (R: 11/6)
c) (-5/3) + (+1) = (R: -2/3)
d) (-4) + (-1/2) = (R: -9/2)
e) (-0,2) + (-1/5) = (R: -2/5)
f) (+0,4) + (+3/5) = (R: 1)
g) (-0,5) + (+0,7) = (R: 1/5 ou 0,2)
h) (-02) + (-1/2) = (R: -7/10)

3) Efetue as seguintes adições:

a) (+5/8) + (+1/2) + ( -2/15) = (R:119/120)
b) (+1/2) + (-1/3) + (+1/5) = (R:11/30)
c) (-1/2) + (-4/10) + (+1/5) = (R: -7/10)
d) (-3/5) + (+2) + (-1/3) = (R: 16/15)

4) Calcule

a) -1 – ¾ = (R: -7/4)
b) (-3/5) + (1/2) = (R: -1/10)
c) 2 – ½ -1/4 = (R: 5/4)
d) -3 -4/5 + ½ = (R: -33/10)
e) 7/3 + 2 -1/4 = (R: 49/12)
f) -3/2 + 1/6 + 2 -2/3 = (R: 0)
g) 1 – ½ + ¼ - 1/8 = (R:5/8)
h) 0,2 + ¾ + ½ - ¼ = (R:6/5)
i) ½ + (-0,3) + 1/6 = (R:11/30)
j) 1/5 + 1/25 + (-0,6) = (R: 1/10)

5) Efetue as multiplicações

a) (-1/2) . (+2/3) . (-3/7) = (R: +1/7)
b) (-2/5) . (-3/2) . (-8/5) = (R: -24/25)
c) (-1/2) . (-1/2) . (-1/2) = (R: -1/8)
d) (-1) . (+5/3) . (+3/5) = (R: -1)
e) (+7) . (-1/7) . (+7) = (R: -7)

EXERCICIOS

6) Efetue as divisões:

a) (+1/3) : (+2/3) = (R: +3/6 ou + 1/2)
b) (+4/7) : ( -2/5) = (R: -20/14 ou -10/7)
c) (-3/5) : (-3/7) = (R: +21/15 ou +7/5)
d) (-3/7) : (+2/3) = (R: -9/14)
e) (+1/9) : (-7/5) = (R: -5/63)
f) (+1/2) : (-3/4) = (R: -4/6 ou -2/3)
g) (-3/4) : (-3/4) = (R: +1)
h) (-7/5) : (+1/2) = (R: -14/5)

7) Efetue as divisões:

a) (+5) : (-3/2) = (R: -10/3)
b) (-4) : (-3/5) = (R: +20/3)
c) (-3) : (-2/9) = (R: +27/2)
d) (-5/2) : (+2) = (R: -5/4)
e) (+4/3) : (-2) = (R: -4/3)
f) (-3/5) : (+0,1) = (R: -6)