Question

Calculeaza utilizand factorul comun
A)12×7+12×3
B)6×10+12×10+17×10
C)5×35+5×70-5×5
D)43×275+57×275
E)175×123+27×123-102×123
F)14•22-14•10-14

Answer 1

a) 12 x 7 + 12 x 3 = 12 (7+3) = 84 + 36 = 120
b) 6 x 10 + 12 x 10 + 17 x 10 = 10 (6+12+17) = 60 + 120 + 170 = 350
c) 5 x 35 + 5 x 70 - 5 x 5 = 5 (35 + 70 + 5) = 175 + 350 + 25 = 550
d) 43 x 275 + 57 x 275 = 275 (43 + 57) = 11825 + 15675 = 27500
e) 175 x 123 + 27 x 123 - 102 x 123 = 123 (175 + 27 - 102) = 21525 + 3321 - 12546 = 24837 - 12546 = 12291
f) 14 x 22 - 14 x - 14 = 14 (22 - 10 - 1) = 308 - 140 - 14 = 154