Question

Efectuați calculele:
a) [(-5).(+14)-(-5).(-12)-(-16).(+14)]:(-12 +10);
b) [(-2).(+18)+(+6)(-15)-(-6).(-13)]:(-65 +68);
c) [(-15).(-4)-(-25).(+7)+(-20).(+3)]:(-43+38). Pls dau coronita​

Answer 1

Răspuns:

a)[(-5)×(+14)-(-5)×(-12)-(-16)×(+14)]:(-12 +10) = -47

b)(-2) × (+18) × (+6)(-15)-(-6) × (-13)]:(-65 + 68) = 1054

c)[(-15) × (-4)-(-25) × (+7)+(-20) × (+3)]:(-43+38) = -35

Explicație pas cu pas:

a)[(-5)×(+14)-(-5)×(-12)-(-16)×(+14)]:(-12 +10) = -47

= (-5 × 14 +5 × (-12) + 16 × 14):(-2) =

= (-70 + 5 × (-12) + 16 × 14):(-2) =

= (-70 - 60 + 224):(-2) =  

= 94 : (-2) = -47

b)[(-2) × (+18) × (+6)(-15)-(-6) × (-13)]:(-65 + 68) = 1054

= (2 × 18 × 6 × 15 + 6 × (-13)) : 3 =

= (2 × 18 × 6 × 15 - 6 × 13) : 3 =

= 6(2 × 18 × 15 - 13) : 3 =

= 6(540 - 13) : 3 =

= 6 × 527 : 3 = 1054

c)[(-15) × (-4)-(-25) × (+7)+(-20) × (+3)]:(-43+38) = -35

= (60 + 25 × 7 - 60):(-5) =  

= (60 + 175 - 60):(-5) =  

= 175 : (-5) = -35