Замените числа ближайшими десятками и вычислите приближённо Сравните результаты. 27+51 и 17+39. 48+25 и 52-15. 43-19 и 28+19. 19+45 и 79-18. 69-22 и 55+33. 15+47 и 18+39.
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48+25 >52-15
43-19 <28+19
19+45<79-18
69-22<55+33
15+47>18+39
27+51 = 30+50 = 80
17+39=20+40=60
48+25=50+30=80
52-15=50-20=30
43-19=40-20=20
28+19=30+20=50
19+45=20+50=70
79-18=80-20=60
69-22=70-20=50
55+33=60+30=90