Giải thích các bước giải:
$\text{a, 4×33+4×67+4×25}$
$\text{= 4×(33+67+25)}$
$\text{= 4×125}$
$\text{= 500}$
$\text{b, 23×16+23×84+300}$
$\text{= 23×(16+84)+300}$
$\text{= 23×100+300}$
$\text{= 2300+300}$
$\text{= 2600}$
$\text{c, 66×53+66×14+33×66}$
$\text{= 66×(53+14+33)}$
$\text{= 66×100}$
$\text{= 6600}$