Question

15- Calcule:

a) (+21) * (+10)=

b) (-9)* (-5)=

c) (+4) * (+9)=

d) (-12) * (-4)=

e) (+8) * (+10)=

f) (-3) * (-7)=

g)(+3).(-2).(+5)=

h) (-2).(-4).(+6).(+5)=​

Answer 1

Resposta:

$a) \: (21) \times (10) \\ 21 \times 10 \\ = 210$

$b) \: ( - 9) \times ( - 5) \\ = 45$

$c) \: 4 \times 9 \\ = 36$

$d) \: ( - 12) \times ( - 4) \\ = 48$

$e) \: 8 \times 10 \\ = 80$

$f) \: ( - 3) \times ( - 7) \\ = 21$

$g) \: 3 \times ( - 2) \times 5 \\ - 6 \times 5 \\ = - 30$

$h) \: ( - 2) \times ( - 4) \times 6 \times 5 \\ 8 \times 6 \times 5 \\ 48 \times 5 \\ = 240$