30
52
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11994
11695
387
291
$a)$ $82,7$ $×$ $7,2$ $+$ $82,7$ $×$ $2,8$
$=$ $82,7$ $×$ $($ $7,2$ $+$ $2,8$ $)$
$=$ $82,7$ $×$ $10$
$=$ $827$
$b)$ $164,7$ $×$ $0,91$ $-$ $64,7$ $×$ $0,91$
$=$ $0,91$ $×$ $($ $164,7$ $-$ $64,7$ $)$
$=$ $0,91$ $×$ $100$
$=$ $91$
$c)$ $0,81$ $×$ $91,6$ $+$ $8,4$ $×$ $0,81$
$=$ $0,81$ $×$ $($ $91,6$ $+$ $8,4$ $)$
$=$ $0,81$ $×$ $100$
$=$ $81$
$d)$ $5,49$ $×$ $2,3$ $×$ $3$ $-$ $4,49$ $×$ $6,9$
$=$ $5,49$ $×$ $6,9$ $-$ $4,49$ $×$ $6,9$
$=$ $6,9$ $×$ $($ $5,49$ $-$ $4,49$ $)$
$=$ $6,9$ $×$ $1$
$=$ $6,9$
$#$ $Khanhlyy$ $<$ $33$
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