123. (125.127- 125 .87) +87.125.123 -123 .125.126

=123. [125.(127-87)] +87.125.123 -123 .125.126

=123. (125.40) +87.125.123 -123 .125.126

=123.5000 +10875.123 -123 .15750

=123.(5000+10875-15750)

=123.125

=15375

b: =100x1000=100000

a)=\(\left[72.\left(-2\right)\right].\left[-50.\left(-2\right)\right]\)

=-144.100

=-14400

b)=(125.8).(-5).(-20)

=1000.100

=100000

c)=\(\left[125.\left(-4\right)\right]\).(-3).(-32)

=-500.96

=-48000

d)=-492.125

=-60500

a) \(3119\cdot121-3119\cdot11\cdot11\\ =3119\left(121-11\cdot11\right)\\ =3119\left(121-121\right)\\ =3119\cdot0=0\)

b) \(24\cdot\left(123+87\right)+\left(87+123\right)\cdot76\\ =\left(123+87\right)\left(24+76\right)\\ =210\cdot100=21000\)

Lời giải:
$(-123)(87-53)-53(123-87)$

$=-123.87+123.53-53.123+53.87$

$=(-123.87+53.87)+(123.53-53.123)$

$=87(53-123)+0=87(-70)=-6090$

=24.210+210.76

=(24+76).210

=100.210

=21000

ok e nha

Trả lời :

Phép so sánh C đúng nhoa bn =))

~ Thiên Mã ~

Đáp án đúng là câu C

a) \(3119\cdot121-3119\cdot11\cdot11\)

\(=3119\cdot121-3119\cdot\left(11\cdot11\right)\)

\(=3119\cdot121-3119\cdot121\)

\(=3119\left(121-121\right)\)

\(=0\)

b) \(24\cdot\left(123\cdot87\right)+\left(87\cdot123\right)\cdot76\)

\(=\left(123\cdot87\right)\cdot\left(76+24\right)\)

\(=\left(123\cdot87\right)\cdot100\)

\(=1070100\)

c: =123-80-123=-80

d: =-19(13+87)=-19*100=-1900