Question

16. Efectuați, folosind factorul comun:
a) 2×17 +2×13;
b) 3×91 +3×9;
c) 5×112-5×12;
d) 6×74-6×24;
e) 2×634 +2×366;
f) 3×245 - 3×145;
g) 2×19 +2×31 +2×50;
h) 14×13 + 13×86;
i) 87×12 - 87×100+ 12×13;
j) 68×123-107×68+16×32.
Repede! Vă rog!
​

Answer 1

Răspuns:

a)2*(17+13)=2*30=60

b)3*(91+9)=3*100+300

c)5*(112+12)=5*124=620

d)6*(74-24)=6*50=300

e)2*(634+366)=2*1000=2000

f)3*(245-145)=3*100=300

g)2*(19+31+50)=2*100=200

h)13*(14+86)=13*100=1300

i)87*(12-100)+12*13=87*(-88)+12x13=-7656+156=-7500

j)68*(123-107)+16*32=68*16+512=+512=1088+512-1600

Explicație pas cu pas: