Question

tính bằng cách thuận tiện: 

a] 125 x 25 +25 x 874 + 25 

b] 47 x 105 - 6 x 47 + 47 

c] 422 x 19 + 422 x 77 + 422 x 4 

giúp mình nhé

 

Answer 1

a] 125 x 25 +25 x 874 + 25 
= 25 x (125 + 874 + 1)
= 25 x 1000 = 25000
b] 47 x 105 - 6 x 47 + 47 
= 47 x (105 - 6 + 1)
= 47 x 100 = 4700
c] 422 x 19 + 422 x 77 + 422 x 4 
= 422 x (19 + 77 + 4)
= 422 x 100 = 42200

Answer 2

 $\mathrm{a)\; 125}\times 25+874\times 25+25$

 $=125\times 25+874\times 25+25\times 1$

$=25\times (125+874+1)$

$=25\times 1000$

$=25000$

____________________________________

 $\mathrm{b)47}\times 105-6\times 47+47$

$=47\times 105-6\times 47+47\times 1$

$=47\times (105-6+1)$

$=47\times 100$

$=4700$

_____________________________________

$422\times 19+422\times 77+422\times 4$

$=422\times (19+77+4)$

$=422\times 100$

$=42200$ 

 

Answer 3

a)      125 

Answer 4

 meme