Calculează în mod convenabil.
a) 43 +389 +57
c) 5 x 20 x 6
d) 4 x 40 x 5
b) 362 + 105 + 405
e) 8 * (25 + 75)
f) (9 +50) x 2
g) (200 + 120): 2
h) (344 +56): 4
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Răspuns:
a)43+389+57
432+57
489
c)5×20×6
100×600
6000
d)4×40×5
160×5
800
e)8×(25+75)
8×100
800
f)(9+50)×2
59×2
118
g) (200+120):2
320:2
160
h) (344+56):4
400:4
100