Răspuns:
3.a) ( 4 + 9 • 7 ) + 3.298 - 1.550 =
= ( 4 + 63 ) + 3.298 - 1.550 =
= 67 + 3.298 - 1.550 =
= 3.365 - 1.550 =
= 1.815
b) ( 6 • 7 - 5 - 19 ) + ( 8 • 6 + 23 ) =
= ( 42 - 5 - 19 ) + ( 8 • 6 + 23 ) =
= ( 37 - 19 ) + ( 8 • 6 + 23 ) =
= 18 + ( 8 • 6 + 23 ) =
= 18 + ( 48 + 23 ) =
= 18 + 71 =
= 89
c) 2.642 + 5 • 9 =
= 2.642 + 45 =
= 2.687
d) 8 • 9 + 1.808 =
= 72 + 1.808 =
=1.880
4. a) 9 + 8 • 9 = 71
b) 6 + 5 • 4 = 26
c) 9 • 9 - 5 = 76
d) 7 • 1 • 7 = 49
