(10+15+20+25+30+35+40+45+50+55+60+65)-(2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44)=?
1)
10+15+20+25+30+35+40+45+50+55+60+65=
450
2)
2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44=506
3)
450-506= -56
А) -56
(10+15+20+25+30+35+40+45+50+55+60+65)-(2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44)=?
1)
10+15+20+25+30+35+40+45+50+55+60+65=
450
2)
2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44=506
3)
450-506= -56
А) -56