12 Calculează în mod convenabil.
a) 43 + 389 +57 c) 5 x 20 x 6
b) 362 + 105 + 405 d) 4 x 40 x 5
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= 489
b) 362 + 105 + 405= 872
c)5×20×6=600
d)4×40×5=160×5=800
e)8×(25+75)=8×100=800
f)2×(9+50)=2×59=118
g)(200+120):2=320:2=160
h)(344+56):4=400:4=100