Question

 

tính thuận tiện :33 x 15 + 44 x 12 + 77

 

Answer 1

Lời giải:

$33\times 15+44\times 12+77$

$=11\times 3\times 15+11\times 4\times 12+11\times 7$

$=11\times 45+11\times 48+11\times 7$

$=11\times (45+48+7)=11\times 100=1100$

Answer 2