Question

1) Calculati,scotând un factor comun:
a) 7×5-7×3 = ?
b) 2×3+3×8-3 = ?
c) 15+15×7 = ?
d) 7×9-7 = ?
e) 143×81+143×11+143×7+143 = ?
2.) Daca x =10 si a + b=8,aflati:
a) 3x + 3a + 3b = ?
b)x + 5a + 5b = ?
c) ax + bx = ?

Urgent Dau COROANA

Answer 1

a) 7(5-3)=7*2=14
b) 3(2+8-1)=3*9=27
c) 15(1+7)=15*8=120
d) 7(9-1)=7*8=56
e) 143(81+11+7+1)=143*100=14300