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

=234 x 24+75x234x234x1

=234x(75+24+1)

=234x100

=23400

đề sai thì phải

a: \(\left(24-234\right)+\left(234-24-77\right)\)

\(=24-234+234-24-77\)

\(=\left(24-24\right)+\left(234-234\right)-77\)

=0+0-77

=-77

b: \(\left(13-135+49\right)-\left(13+49\right)\)

\(=13-135+49-13-49\)

\(=\left(13-13\right)+\left(49-49\right)-135\)

=0+0-135

=-135

c: \(159-524-\left(59-424\right)\)

\(=159-524-59+424\)

\(=\left(159-59\right)-\left(524-424\right)\)

=100-100

=0

d: \(\left(36+79\right)+\left(145-79-36\right)\)

\(=36+79+145-79-36\)

\(=\left(36-36\right)+\left(79-79\right)+145\)

=0+0+145

=145

e: \(334-\left(117+234\right)+\left(42+117\right)\)

\(=334-117-234+42+117\)

\(=\left(334-234\right)+\left(117-117\right)+42\)

=100+0+42

=142

f: \(271-\left[\left(-43\right)+271-\left(-17\right)\right]\)

\(=271+43-271+\left(-17\right)\)

\(=\left(271-271\right)+\left(43-17\right)\)

=0+26

=26

thanks

a) \(A=\frac{27\text{x}45+27\text{x}25}{2+4+6+8+...+18}=\frac{27\left(45+25\right)}{\left(18+2\right)\text{x}\left(\frac{18-2}{2}+1\right)}\)

\(A=\frac{27\text{x}70}{20\text{x}9}=\frac{3\text{x}9\text{x}10\text{x}7}{10\text{x}2\text{x}9}\)

\(A=\frac{21}{2}\)

b) \(B=\frac{28\text{x}108-52\text{x}12}{32-28+24-20+16-12+8-4}\)

\(B=\frac{28\text{x}12\text{x}9\text{​​}\text{​​}-52\text{x}12}{\left(32-28\right)+\left(24-20\right)+\left(16-12\right)+\left(8-4\right)}\)

\(B=\frac{12\left(28\text{x}9-52\right)}{4+4+4+4}=\frac{12\text{x}200}{4\text{x}4}\)

\(B=\frac{4\text{x}3\text{x}4\text{x}50}{4\text{x}4}=150\)

cám ơn bn

a. ưcln(16,24)=8

=> ưc(16,24)=ư(8)={1;2;4;8}

b,c tương tự