(67+235-112)-(35-33-112)
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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}
\(\left(\frac{4}{5}+\frac{1}{5}\right)-\left(\frac{123}{235}+\frac{112}{235}\right):\frac{1}{2}\)
\(=1-1:\frac{1}{2}=-1\)
a, 28 . (-2).3 - { 136 + [54 - 28 : (69 - 71).2 ]}
=-168- { 136 + [54 - 28 : (-2).2 ]}
=-168 - [136 + (54+28)]
=-168 - 218
=-386
b) 203.46-203.37+203
=203.46-203.37+203.1
=203.(46-37+1)
=203.10
=2030
c)21+23+25+27+29-31-33-35-37-39
=(21-31)+(23-33)+(25-35)+(27-37)+(29-39)
= -10 + (-10) + (-10) + (-10) + (-10)
=-50
d) 18.17-3.6.17
=18.17-18.17
= 0
e,33. ( 107- 112) - 107 . ( 33- 112)
=33.107- 33.112- 107.33+107.112
=(33.107- 33.112- 107.33)+107.112
=33(107-112-107)+107.112
=-33.112+107.112
=112.(-33+107)
=112.74
=8288
a) 23 : 12 + 4 : 12
= ( 23 + 4 ) : 12
= 27 : 12
= 2,25
b) 235 ; 15 - 112 : 15
= ( 235 -112) : 15
= 123 : 15
= 8,2
\(\dfrac{111\times118-33}{112\times115+185}\)
= \(\dfrac{111\times\left(115+3\right)-33}{\left(111+1\right)\times115+185}\)
= \(\dfrac{111\times115+111\times3-33}{111\times115+115\times1+185}\)
= \(\dfrac{111\times115+333-33}{111\times115+115+185}\)
= \(\dfrac{111\times115+300}{111\times115+300}\)
= 1
1) 67 -12 + 112 +85 - 74 = 178
2) 89 - 74 = 15
ủng hộ nha
300
= 300