Question

tính nhanh:a, 9x435x4+12x565x3 

b, 4x1368x21-7x368x12

Answer 1

\(a,9\times435\times4+12\times565\times3\)

\(=36\times435+36\times565\)

\(=36\times\left(435+565\right)\)

\(=36\times1000\)

\(=36000\)

\(b,4\times1368\times21-7\times368\times12\)

\(=84\times1368-84\times368\)

\(=84\times\left(1368-368\right)\)

\(=84\times1000\)

\(=84000\)

Answer 2

TL

$a)9\times 435\times 4+12\times 565\times 3$

$=36\times 435+36\times 565$

$=36\times \left(435+565\right)$

$=36\times 1000$

$=36000$

$b)4\times 1368\times 21-7\times 368\times 12$

$=84\times 1368-84\times 368$

$=84\times \left(1368-368\right)$

$=84\times 1000$

$=84000$

$HT$