Question

a=(3+6+9+12+... +147)+125

Answer 1

dai 3 ( 1+2+3+...+49)+125= 3(49×50 totul supra 2) +125
=1225×3 +125 =3675 +125=38 00

Answer 2

$a = (3 + 147) \times 49 \div 2 + 125$
$a = \frac{150 \times 49}{2} + 125$
$a = \frac{7350}{2} + 125$
$a = 3675 + 125 = 3800$