Номер 556

1) 742 + 39 + 58 = (742 + 58) + 39 = 800 + 39 = 839;

2) 973 + 115 – 273 – (973 – 273) + 115 = 700 + 115 = 815;

3) 832 – 15 – 32 = (832 – 32) –15 = 800 – 15 = 785;

4) 2 · 115 · 50 = 115 · (2 · 50) = 115 · 100 = 11 500;

5) 29 · 19 + 71 · 19 = (29 + 71) · 19 = 100 · 19 = 1900;

6) 192 · 37 – 92 · 37 = (192 – 92) · 37 = 100 · 37 = 3700.