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a)(10+20+30)+10+20+(-30)+(-40)+(-30);
b)(30+50+10)+30+(+50)+10+30+50+(-10)+(-30)+50+(-10).​


Răspuns :

à) 20

b)

à) 30+30+(-30)+(-40)+(-30) =60+(-30)+(-40)+(-30) =30+(-10)=20

b) 90+30+(+50)+90+(-10)+(-30) +40=120+(+50)+90 +(-10)+(-30)=170+80+(-30)=230+(-10)=220

Răspuns:

Explicație pas cu pas:

a).

60+10+20-30-40-30=

60+30-100=

90-100 =

-10

b).

90+30+50+90-10-30+50-10=

120+140-40+50-10=

260-50+50=

=260