Question

Calcula:
a) (+5) + (-2) = b) (+4) - (-2) =

c) (+7) - (+4) = d) (-8) - (-5) =

4. Calcula :

a) (2 – 3) – (2 – 6) + (4 – 1) = b) 5 – (2 – 3) + (4 – 8) =



c) (4 – 3) + (3 – 5) + (2 – 1) = d) (3 – 5 + 4) – (2 – 2 + 5) =



5. Calcula :

a) (+4) · (+10) = b) (+25) · (-10) =

c) (-32) :(-4) = d) (-28) :(-7) =

Answer 1

3. Calcula:

a)

$\left(5\right)+\left(-2\right)\\=5-2\\=3$

b)

$\left(+4\right)-\left(-2\right)\\=4+2\\=6$

c)

$\left(+7\right)-\left(+4\right)\\=7-4\\=3$

d)

$\left(-8\right)-\left(-5\right)\\=-8+5\\=-3$

4. Calcula:

a)

$\left(2-3\right)-\left(2-6\right)+\left(4-1\right)\\=-1-\left(2-6\right)+\left(4-1\right)\\=-1-\left(-4\right)+\left(4-1\right)\\=-1-\left(-4\right)+3\\=6$

b)

$5-\left(2-3\right)+\left(4-8\right)\\=5-\left(-1\right)+\left(4-8\right)\\=5-\left(-1\right)-4\\=2$

c)

$\left(4-3\right)+\left(3-5\right)+\left(2-1\right)\\=1+\left(3-5\right)+\left(2-1\right)\\=1-2+\left(2-1\right)\\=0$

d)

$\left(3-5+4\right)-\left(2-2+5\right)\\=2-\left(2-2+5\right)\\=2-5\\=-3$

5. Calcula:

a)

$\left(+4\right)\left(+10\right)\\=4\cdot \:10\\=40$

b)

$\left(+25\right)\left(-10\right)\\=-25\cdot \:10\\=-250$

c)

$\frac{-32}{-4}\\=\frac{32}{4}\\=8$

d)

$\frac{-28}{-7}\\=\frac{28}{7}\\=4$