Question

COROANA! Efectuati:
a) 39×12+[(19×6-14×5)×8-(21×5-7×13)×14]×3= ?
b) 4×{6×3-[3×(16+9)-2×3+5-18×4]×3}-(29-16+2)×3= ?
c) [(15-3×4)×5-9]×8-2[13-(5×7-6×4)+4×5]= ?

Urgent!Dau Coroana!

Answer 1

rezolvarea la a) este:

Answer 2

a) 39x12+[(19x6-14x5)x8-(21x5-7x13)x14]x3=
=468+[(114-70)x8-(105-91)x14]x3
=468+[(44x8)-(14x14)]x3
=468+[(352-196)]x3
=468+(156x3)
=468+368
=836
b)4x{6x3-[3x(16+9)-2x3+5-18x4]x3}-(29-16+2)x3=
=4x{18-[3x25-6+5-72]x3}-15x3=
=4x[18-(75-6+5-72)x3]-15x3=
=4x[18-(2x3)]-45=
=4x(18-6)-45=
=4x12-45=
=48-45=
=3
c)[(15-3x4)x5-9]x8-2[13-(5x7-6x4)+4x5]=
=[(15-12)x5-9]x8-2[13-(35-24)+20]=
=(3x5-9)x8-2(13-11+20)=
=(15-9)x8-2(2+20)=
=6x8-2x22=
=48-44=
=4
Sper ca team ajutat!
 
Coroana pls