Question

efectueaza calculele folosind factorul comun
a ) 93 x 13 -97x3
b) 109x15-14x109
c)328x35-328x25
d)1991x1990-1991x1989
e)56x35+65x56
f)1994x1991+9x1994

Answer 1

a) 3(31x13-97)=3(403-97)= 3x306=918
b) 109(15-14)= 109x1=109
c)328(35-25)=3280
d) 1991(1990-1989)=1991x1=1991
e) 56(35+65)=56x100=5600
f) 1994(1991+9)= 1994 x 2 x 1000 = 3988000
Succes si o seara buna in continuare!

Answer 2

a. 31·3·13 - 97·3 = 3( 31·13 - 97)=3·(403-97)=3·306= 918
b. 109·(!5-14)= 109·1=109
c. 328·(35-25) = 328·10=3280
d. 1991·(1990-1989)= 1991·1 =1991
e. 56·(35+65)= 56·100= 5600
f. 1994·(1991+9)=1994·2000=3988000