a) 166.(-127)+166.234+(-234).166-234.127

  166.(-234+234)+127.(-166-234)

=0+127.(-400)

=-50800

b) 53.39+43.39-53.21-47.21

=39.(53+43)+(-21).(53+47)

=39.96+(-21).100

=-1644

k cho minh

ai làm nhanh tui k cho ạ, giúp vs đang cần gấp

-234-(123-234)

= -234-123+234

= 123

a, -234-(123-234)

=-234-123+234

=(-234+234)-123

=0-123

-123

b, -24 . 33+ 40 . 24 +13 . 30 +13 . 46

= 24x(-33+40)+13(30+46)

=24.7+13.76

=98+988

=1086

c, 34 . (-84)+ 17 . (-32)

=34.(-84-16)

=34.-100

=-3400

a, -234-(123-234)

=  -234-123+234

=  (-234+234)-123

=  0-123

=  -123

b, -24 . 33+ 40 . 24 +13 . 30 +13 . 46

=  24 . ( -33 ) + 40 . 24 + 13 . 30 + 13 . 46

=  24 . [ -33 + 40 ] + 13 . [ 30 + 46 ] 

=  24 . 7 + 13 . 76

=  168 + 988

=  1156

a) (-30) + 17 + (-70) + 33

=[-30+(-70)]+(17+33)

=-100+50

=-50

b) 56 - 15 - 6 + (-75)

=(56-6)-[15+(-75)]

=50-(-60)

=110

c) (157 - 56) - (44 + 57)

=157-56-44+57

=(-157-57)-(56+44)

=-100-100

=-200

d) (-24 + 174) - (174 - 24)

=-24+174-174+24

=(-24+24)+(174-174)

=0+0

=0

e) (35 - 47) - (-123 + 35) + [20 - (123 - 57)]

=35-47+123-35+[20-123+57]

=35-47+123-35+20-123+57

=(35-35)+(123-123)+(-47+57)

=0+0+(-10)

=-10

Bn sai ở câu e dòng 4

a: \(-177-\left\lbrack89+\left(-177\right)+75\right\rbrack-\left(-25\right)\)

=-177-[89-177+75]+25

=-177-89+177-75+25

=-89-50

=-139

b: \(2\cdot\left\lbrack16+\left(-12\right)-5\right\rbrack+\left(-32\right)-\left(-10\right)\)

\(=2\cdot\left\lbrack16-17\right\rbrack-32+10\)

=2*(-1)-32+10

=-34+10

=-24

c: \(56\cdot53-\left\lbrack57+\left(-75\right)-\left(-9\right)\cdot2\right\rbrack\)

=2968-[57-75+18]

=2968

d: \(16\cdot\left(-45\right)+16\cdot34-\left(-16\right)\cdot\left(-89\right)\)

\(=16\left(-45+34\right)-16\cdot89\)

\(=16\left(-11-89\right)=16\cdot\left(-100\right)=-1600\)

e: \(77\cdot18-\left(-77\right)\cdot60+\left(-77\right)\cdot\left(-22\right)\)

\(=77\cdot18+77\cdot60+77\cdot22\)

\(=77\left(18+60+22\right)=77\cdot100=7700\)

166.(-127+234)-234.(166+127)

= 166.(-127)+166.234-234.166-234.127

=[166.(-127)-234.127]+(166.234-234.166)

=(-127).(166+234)+0

=(-127).400

=-50800

Trl :

166×(-127+234)-234×(166+127)

=166*(-127)+166*234-234*166+234*127

=[166*234-234*166]+[166*(-127)+234*127]

=[166*(234-234)]+[(-166)*127+234*127]

=(166*0)+[127*(-166+234)]

=0+127*68

=127*68

=8636

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\(166.\left(-127+234\right)-234.\left(166+127\right)\)

\(=\)\(166.107-234.293\)

\(=\)\(17762-68562\)

\(=\)\(-50800\)

\(53.39+47.39-53.21-47.21\)

\(=\)\(39.\left(53+47\right)-21.\left(53+47\right)\)

\(=\)\(39.100-21.100\)

\(=\)\(100.\left(39-21\right)\)

\(=\)\(100.18\)

\(=\)\(1800\)