Question

Sa stiti ca acesta * este ori eu il pun asa deoarece nu am ori.
Va rog urgent
Efectueaza,folosind factorul comun:
a)398*457-398*456=
b)1456*345+1456*655=
c)237*346+346*49-346*285=
d)99*1457+99*457-99*1914=


Efectueaza,folosind factorul comun:
a)107*43+107*56+107=
b)46*39+46*46+47+86*32+86*23

Daca a si b sunt numere naturale astfel incat

3*a+2*b=2020,calculeaza:
a)6*a+4*a=
b)9*a+6*b=
c)12*a+9+8*b=
Dau coroana si 40 puncte

Answer 1

a)398*457-398*456=398*(457-456)=398*1=398

b)1456*345+1456*655=1456*(345+655)=1456*1000=1456000

c)237*346+346*49-346*285=346*(237+49-285)=346*1=346

d)99*1457+99*457-99*1914=99*(1457+457-1914)=99*0=0

Efectueaza,folosind factorul comun:

a)107*43+107*56+107=107*(43+56+1)=107*100=10700

b)46*39+46*46+47+86*32+86*23=46*(39+46)+47+86*(32+23)=46*85+47+86*55

Daca a si b sunt numere naturale astfel incat

3*a+2*b=2020,calculeaza:

a)6*a+4*a=2*(3*a+2*b)=2020*2=4040

b)9*a+6*b=3*(3*a+2*b)=2020*3=6060

c)12*a+9+8*b=4*(3*a+2*b)+9=2020*4+9=8089