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\(=\dfrac{8}{29}-\dfrac{4}{29}+\dfrac{-4}{17}+\dfrac{21}{17}-2=\dfrac{4}{29}-1=-\dfrac{25}{29}\)
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a) 3 8 + − 5 8 − 1 8 = 3 − 5 − 1 8 = − 3 8
b) 3 4 − − 1 2 + 1 6 = 9 12 + 6 12 + 2 12 = 17 12
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\(a.=415+58-415-38\)
\(=\left(415-415\right)+\left(58-38\right)\)
\(=0+30\)
\(=30\)
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a: =(21-11)+(22-12)+(23-13)+(24-14)
=10+10+10+10
=40
b: =(34-14)+(35-15)+(36-16)+(37-17)
=20+20+20+20
=80
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a) - 2 < x < 3 = > x ∈ {0;1;2}
b) 25 32 < x < 4 => x ∈ {1;2;3}
c) – 5 < x < - 2 = > x = ∅
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58 x 32 + 32 x 8 + 16 x 5
= 32 x ( 58 + 32 ) + 16 x 5
=32 x 90 + 16 x 5
= 16 x 2 x 90 + 16 x 5
= 16 x 180 + 16 x 5
= 16 x ( 180 + 5 )
= 16 x 185
= 2960
\(58.32+32.8+16.5\)
\(=16.116+16.16+16.5\)
\(=16.\left(116+16+5\right)\)
\(=16.137\)
\(=2192\)
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(x-16)+34=58
=> (x-16) = 58 - 34
=> (x-16) = 24
=> x = 24 + 16
=> x = 40
Vậy x = 40
( x - 16 ) + 34 = 58
( x - 16 ) = 58 - 34
x - 16 = 24
x = 24 + 16
x = 40
Vậy x = 40