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42+18x {50+3x [21+2x (529-8x48)-12x2]-900}-43
Dau coroana +2013+[23x43+(212x18-93x31)-49x7] dau coroana + 70+2{72:8+3x [30+3(500:4-49x2 dau coroana +2014 -{2012-[2012-(2013-2012)]}
Sunt 4 exercitii dupa fiecare dau coroana este alt exercitiu . Va multumesc


Răspuns :

1.
42+18*{50+3*[21+2*(529-8*48)-12*2]-900}-43 =
42+18*{50+3*[21+2*(529-384)-24]-900}-43=
42+18*[50+3*(21+2*145-24)-900]-43=
42+18*[50+3*(21+290-24)-900]-43=
42+18*[50+3*(311-24)-900]-43=
42+18*(50+3*287-900)-43=
42+18*(50+861-900)-43=
42+18*(911-900)-43=
42+18*11-43=
42+198-43=
240-43=197

2.
2013+[23*43+(212*18-93*31)-49*7]=
2013+[989+(3816-2883)-343]=
2013+(989+933-343)=
2013+(1922-343)=
2013+1579=3592

3.
70+2*{72:8+3* [30+3(500:4-49*2)]}=
70+2*{9+3*[30+3*(125-98)]}=
70+2*[9+3*(30+3*27)]=
70+2*[9+3*(30+81)]=
70+2*(9+3*111)=
70+2*(9+333)=
70+2*342=
70+684=754

4.
2014 -{2012-[2012-(2013-2012)]}=
2014-[2012-(2012-1)]=
2014-(2012-2011)=
2014-1=2013