пмогите дз по математике 5 класс

41. 1) 279 + 56 = 279 + (21 + 35) = (279+21) + 35 = 300+ 35 = 335

2) 313 + 88 = 313 + (87+1) = (313+87)+1 = 400+1 = 401

3) 577+44 = 577+(23+21) = (577+23)+21 = 600+21 = 621

4) 94+628 = 94+(6+622) = (94+6)+622 = 100 + 622 = 722

5) 181+438= 181 + (19+419) = (181+19)+419 = 200 + 419 = 619

6) 166+255 = 166+(34+221) = (166+34) +221 = 200+221 = 421

7) 1205+796 = 1205 + (95+701) = (1205+95)+701 = 1300 + 701 = 2001

8) 2088+233 = 2088+(12+221) = (2088+12)+221 = 2100 + 221 = 2321

279+56=279+(40+16)=(260+19)+56=280+55=335

313+88=313+(70+18)=(300+13)+88=320+81=401

577+44=577+(40+4)=(500+77)+44=566+33=621