Question

Calculeza folosind factorul comun:a)7*37+45*7;b) 23+9*23;c)41*32-41*22;d)10+20+30+40+50;e)14+21+28+35;f)4*2017+2017*2013-2017.

Answer 1

a)7×37+45×7=7(37+45)
=7×82=574
b)23+9×23=23(1+9)
=23×10=230
c)41×32-41×22=41(32-22)
=41×10=410
d)10+20+30+40+50=10(1+2+3+4+5)
=10×15=150
e)14+21+28+35=7(2+3+4+5)
=7×14=98
f)4×2017+2017×2013-2017
=2017(4+2013-1)=2017×2016=4066272

Answer 2

a) 7x37+45x7 =7x(37+45)

=7x82=574

b)23+9x23x1=23x9=207

c)41x32-41x22=41x(32-22)=41x10=410

d)10+20+30+40+50=10+40+20+30+50=50+50+50=100+50=150

e)14+21+28+35=35+63=98

f)4x2017+2017x2013-2017=2017x(4+2013)=2017x2017=4.068.289

Sper că te-am ajutat!