1. Calculează folosind factorul comun: a) 4. 15 + 4. 85; b) 5+5. 7+5-15; c) 220 26 +24323 - 24-103; d) 71 -10 + 71 50 + 140-71; e) 342 201 - 201 - 201-30; f) 493 +52-493-493-11; g) 302 23+302-15-17-302*302; h) 5 423-943-722-5423-7-5423-28-5423 i) 2 022-1010+2 022-1013-2023-2012; j) 15 19 5+15-19 -6-15-19. .
Răspunsuri la întrebare
Răspuns:
a)4×15+4×85=4×(85+15)
=4×100
=400
b) 5+5×7+5×15=5×(7+15)+5
=5×22+5
=110+5
=115
c)220×26+24×323-24×103=24×(323-103)+220×26
=24×220+5720
=11.000
d)71×10+71×50+120×71=71×(10+50+140)
=71×200
=14.200
e)342×201-201-201×30=201×(342-30)-201
=201×312-201
=62.712-201
=62.511
f)493+52×493-493×11=493×(52-11)+493
=493×41+493
=20.213+493
=20.706
g)302×23+302×15-17×302+302=302×(23+15-17)+302
=302×21+302
=6342+302
=6644
h)5423×943-722×5423-7×5423-28×5433=
=5423×186
=1.008.678
i) 2022×2010+2022×1013=2022×(1011+1013-2012)
=2022×1011
=2.044.242
j)15×19×5+15×19×6-15×19=19×(15×5+15×6-15)
=19×150
=2850
sper că am ajutat!!!!