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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) Ta có: 16=4^2=2^4
24=3.8=3.2^3
ƯCLN(16,24)=2^3=8
ƯC(16,24)=Ư(8)={1,2,4,8}
b) Ta có: 180=2^2.3^2.5
243=2.3^2.13
60=2^2.3.5
90=2.3^2.5
135=3^3.5
ƯCLN(234,180,60,90,135)=3
ƯC(234,180,60,90,135)=Ư(3)={1,3}
\(a,16=2^4;24=3.2^3\)
\(=>\left(16;24\right)=2^3=8\)
\(b,180=2^2.3^2.5;234=2.3^2.13\)
\(=>\left(180;234\right)=2.3^2=18\)
\(c,60=3.4.5;90=2.3^2.5;135=3^3.5\)
\(=>\left(60,90,135\right)=3.5=15\)
\(a.16=2^4\)
\(24=2^3.3\)
\(\RightarrowƯCLN\left(16,24\right)=2^3=8\)
\(b.180=2^2.3^2.5\)
\(234=2.3^2.13\)
\(\RightarrowƯCLN\left(180,234\right)=2.3^2=18\)
\(c.60=2^2.3.5\)
\(90=2.3^2.5\)
\(135=3^3.5\)
\(\RightarrowƯCLN\left(60,90,135\right)=3.5=15\)
mk nhé bạn ^...^ ^_^
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
a) (-24) + 18 + 24 + (-28)
= (-24 + 24) + (18 - 28)
= 0 - 28
= -28
b) (-32) . 234 + 234
= 234 . (-32 + 1)
= 234 . (-31)
= -7254
a, (-24) + 18 + 24 +(-28)
= (-24) + 24 - (28 - 18)
= 0 - 10
= - 10
b, (-32) x 234 + 234
= - 234 x ( 32 - 1)
= -234 x 31
= - 7254