1) a. 17*12+17*18
=17*(12+18)
=17*30
=510
b.45*22+22*55=
=22*(45+55)
=22*100
=2200
c.24*156+24*31-24*87=
=24*(156+31-87)
=24*100
=2400
d.511*22+489*22=
=22*(511+489)
=22*1000
=22000
e.)67*377+377*33=
=377*(67+33)
=377*100
=37700
f.32+32*15+32-84=
=32*(1+15+1)-84
=32*17-84
=544-84
=460 Aici cred ca ai cris gresit tu exercitiul.
2.a.8a+8b=8*(a+b)
b.15a-7a=a*(15-7)=a*8
c.6x+6y-6z=6*(x+y-z)
d.50a-25a= 25a(2-1)=25a
e.3x+5x-2x= x(3+5-2)=x*6
f.12a-16b= 4(3a-4b)
g.18x-12z+24t=6(3x-2z+4t)
h.9x+9y+9z-9a=9(x+y+z-a)
i. 5x+10y-15a=5(x+2y-3a)
j. 18a-27b= 9(2a-3b)
k. 8xy-8xz=8x(y-z)
l. 3xa+5xa-2xa=xa(3+5-2)=xa*6