Question

Efecutati:
e) {(7-5)x6x(4x3-10)-[3+(4x9-7x5)+3x2]}x2-28;
f) 39x12+[(19x6-14x5)8-(21x5-7x13)x14]x3
g) 4x{6x3-[3x(16+9)-2x3+5-18x4]x3}-(29-16+2)x3
h) [(15-3x4)x5-9]x8-2[13-(5x7-6x4)+4x5]
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Answer 1

e) {(7-5)x6x(4x3-10)-[3+(4x9-7x5)+3x2]}x2-28=
={2x6x(12-10)-[3+(36-35)+6]}x2-28
=[12x2-(3+1+6]x2-28
=(24-10)x2-28
=14x2-28
=28-28
=0
f) 39x12+[(19x6-14x5)8-(21x5-7x13)x14]x3=
=468+[114-70)8-(105-91)x14]x3
=468+[(44x8)-14x14]x3
=468+(352-196)x3
=468+156x3
=468+468
=936
g) 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]-45
=4x[18-(69-67)x3]-45
=4x(18-2x3)-45
=4x(18-6)-45
=4x12-45
=48-45
=3
h) [(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