Question

como se resolve isso? a) (-2).(-3)+(-1+5) b) (-12+10).(-20+30) c) (+20-5)×(+12-4)-(-1+3) d) (-2)×(-5+3)-(-4+7)×(+4-1) e) (+12+3):(-10+5)-(-1+8) f)(-8):(+4-2)-(-12):(-5+7)

Answer 1

a) (-2).(-3)+(-1+5) = (-2x-3) + 4 = 6+4 = 10
b)(-12+10).(-20+30) = (-2).(10) = -20
c)(+20-5).(+12-4)-(-1+3)= (15).(8)-(+2) = 120-2 = 118
d)(-2).(-5+3)-(-4+7).(4-1)= (-2).(-2)-(3).(3) = 4 - 9 = -36
e)(12+3):(-10+5)-(-1+8)=(15:-5)-9 = -3-9 = -12
f)(-8):(4-2)-(-12):(-5+7)= (-8:2)-(-12:2) = -4+6 = +2