Question

Efectuati {21+20*[19+18*(17-8*2)+16*(15*14-200)-11]}-3*(21-17) rezultatul la acesta trebuie sa fie 3729
b) {47*(16*8-16*17)+46*(15*7-15*5)+45*[14*(13*11-13*7)]}*(11-2*4) rezultatul la acesta trbuie sa fie 104676
Va rog ajutatima!

Answer 1

{21+20*[19+18*(17-8*2)+16*(15*14-200)-11]}-3*(21-17)=
={21+20*[19+18*1+16*(210-200)-11]}-3*4=
=[21+20*(19+18+16*10-11)]-12=
=[21+20*(37+160-11)]-12=
=21+20*186-12=
=21+3720-12=
=3729


b) {47*(16*18-16*17)+46*(15*7-15*5)+45*[14*(13*11-13*7)]}*(11-2*4)=
={47*(288-272)+46*(105-75)+45*[14*(143-91)]}*(11-8)=
=[47*16+46*30+45*(14*52)]*3=
=(752+1380+45*728)*3=
={2132+32760)*3=
=34892*3=
=104676