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a,(38-129+43)-(43+38)=38-129+43-43-38=(38-38)+(43-43)-129=-129
b,-144-[29-(+144)-(-144)=-144-29+144-144=(144-144)-29-144=-173
c)48+|48-174|+(-74)=18+126-74=70
d)(-123+77)-(277-23-123)=-123+77-277+23+123=(-123+123)+(77-277)+23=-200+23=-177
e)-(-57-159)+(43-169)=57+129+43-169=(57+43)+(129-169)=100-40=60
Chúc bạn học tốt( sai chỗ nào cho mjk sr nka??) k cho mjk nka
\(3^{^{ }2}\) . 5 + 23.10 - 81: 3
= 9.5 + 8.10 - 27
= 45 + 80 - 27
= 125 - 27
= 98
\(3^2\cdot5+2^3\cdot10-81:3\)
\(=9\cdot5+8\cdot10-3^4:3\)
\(=40+80-3^3\)
\(=120-27\)
\(=93\)
Ta có : (-123) + 77 + (-257) + 23 - 43
= (-123 + 23) + (77 - 257) - 43
= -100 + 180 - 43
= 80 - 43
= 37
\(\left(-123\right)+77+\left(-257\right)+23-43\)
\(=\left(-123\right)+23+\left(-257\right)+77-43\)
\(=\left(-100\right)+\left(-180\right)-43\)
\(=\left(-280\right)-43=-323\)
\(a,31.\left(-18\right)+31.\left(-81\right)-31\)
\(=31\left(-18-81-1\right)\)
\(=31\left(-100\right)\)
\(=-3100\)
\(b,13\left(23+22\right)-3\left(17+28\right)\)
\(=299+286-51-84\)
\(=450\)
\(a,36.19+36.81\)
\(=36.\left(19+81\right)\)
\(=36.100\)
\(=3600\)
\(b,8.12.125.5\)
\(=\left(125.8\right)\left(12.5\right)\)
\(=1000.60\)
\(=60000\)
\(c,\)chịu
c,7 x 9 + 14 x 27 + 21 x 36 / 21 x 27 + 42 x 81 + 63 x 108
7 x 9 + 14 x 27 + 21 x 36 / 7 x 3 x 9 x 3 + 14 x 3 x 27 x 3 + 21 x 3 x 36 x 3
1 / 3 x 3 + 3 x 3 + 3 x 3
1 / 9 + 9 + 9
1 / 27
-23.63+23.21-58.23
=23.(-63)+23.21-58.23
=23.(21-63-58)
=23.(-100)
=-2300
a: \(-81\cdot36+\left(-81\right)\cdot63-81\)
\(=36\cdot\left(-81\right)+63\cdot\left(-81\right)+\left(-81\right)\)
\(=-81\left(36+63+1\right)\)
\(=-81\cdot100=-8100\)
b: \(23\cdot\left(-38+123\right)-123\cdot\left(23-38\right)\)
\(=-23\cdot38+23\cdot123-123\cdot23+123\cdot38\)
\(=123\cdot38-23\cdot38=38\left(123-23\right)=38\cdot100=3800\)