B

B

Chọn B

523-123:(16:2)x26+152.25

=523-123:8x26+152.25

=523-15.375x26+152.25

=523-399.75+152.25

=123.25+152.26

=275.5

k cho mk nha!

=523 - 123 : 8  * 26 + 152,25

= 523 - 15,375 * 26 +152,25

= 523 - 399,75 +152,25

= 123,25 + 152,25

=275,5

\(141\cdot25+216109\cdot3\)

\(=3\cdot47\cdot25+216109\cdot3\)

\(=3\left(47\cdot25+216109\right)\)

\(=3\cdot217284=651852\)

\(523790-305\cdot26\cdot3\)

\(=2\cdot5\cdot52379-2\cdot5\cdot13\cdot61\cdot3\)

\(=10\left(52379-13\cdot61\cdot3\right)\)

\(=10\cdot50000=500000\)

a )   5 4 9 − 9 7 12 − 4 5 9 = 5 4 9 + 4 5 9 − 9 7 12 = 10 − 9 7 12 = 5 12 .

b ) 8 1 3 + 7 , 8 + 5 2 3 − 1 , 8. = 8 1 3 + 5 2 3 + 7 , 8 − 1 , 8 = 14 + 6 = 20

1776

1776

tick đúng cho mình nhé

a ) 172 17 b ) 10 3 c ) − 21 65 . d ) 20

= 523*(36:1)

=523*36

=18828

thôi cảm ơn các bạn đã quan tâm

mình biết đáp án rồi nhé:2092

Ta có  B = 7 − 5 2 3 + 19 − 6 2 = ( 1 − 2 ) 3 3 + ( 3 2 − 1 ) 2 = 1 − 2 + 3 2 − 1 = 2 2 .