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a) \(-75+\left(-325\right)+\left|-45\right|-\left(-125\right)\)
\(=-75-325+45+125\)
\(=\left(45+125\right)-\left(75+325\right)\)
\(=170-400\)
\(=-230\)
b) \(62+\left|128\right|-\left|-155\right|-\left|70\right|\)
\(=62+128-155-70\)
\(\Leftrightarrow190-225\)
\(=-35\)
c) \(815+\left[95+\left(-815\right)+\left(-45\right)\right]\)
\(=815+95-815-45\)
\(=\left(815-815\right)+\left(95-45\right)\)
\(=0+50\)
\(=50\)
d) \(5+\left(-7\right)+9+\left(-11\right)+...+25+\left(-27\right)\)
\(=\left(5-7\right)+\left(9-11\right)+...+\left(25-27\right)\)
\(=-2-2-...-2\)
\(=-2.11\)
\(=-22\)
e) \(34+35+36+37-24-25-26-27\)
\(=\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\)
\(=10+10+10+10\)
\(=40\)
a) = 1152 - 684-1152-48-684
=(1152-1152)-(684-684)-48
=0 - 0 -48
= -48
a, \(996+45=996+4+41=1000+41=1041\)
b, \(37+198=2+35+198=200+35=235\)
a) 996 + 45 b) 37 + 198
=996+41+4 =2+35+198
=(996+4)+41 =(2+198)+35
=1000+41 =100+35
=1041 =135
34 + 35 + 36 + 37 - 14 - 15 -16 -17
=(34-14)+(35-15) + (36-16) +(37-17)
= 80
mk ko bít có đúng ko
34 + 35 + 36 + 37 - 14 - 15 - 16 - 17
= ( 34 - 14 ) + ( 35 - 15 ) + ( 36 - 16 ) + ( 37 - 17 )
= 20 + 20 + 20 + 20
= 20 x 4
= 80
a) 996 + 45 b) 37 + 198
= (996 + 4) + 41 = 35 + (2 + 198)
= 1000 + 41 = 35 + 200
= 1041 = 235
\(a,996+45\)
\(=\left(996+4\right)+41\)
\(=1000+41\)
\(=1041\)
\(b,37+198\)
\(=\left(198+2\right)+35\)
\(=200+35\)
\(=235\)
a) x ∈ {-2;-1;;0;1;2;3}
b) x ∈ {10;11;12}
c) x ∈ {0;1;2;3;4;5}
d) x ∈ {-1;0;1;2}
b,-146+|-37|-(37-146)= -146 + 37 - 37+ 146
= (-146+146)+(37-37)
=0