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a) -( -35 + 7 - 13 ) + ( 2 - 35 ) - ( 13 - 7 )
= 35 - 7 + 13 + 2 - 35 - 13 + 7
= ( 35 - 35 ) + ( -7 + 7 ) + ( 13 - 13 ) + 2
= 0 + 0 + 0 + 2
= 2
b) ( 70 + 8 - 35 ) - ( 8 - 37 - 10 ) - 70
= 70 + 8 - 35 - 8 + 37 + 10 - 70
= ( 70 - 70 ) + ( 8 - 8 ) + ( -35 + 37 ) + 10
= 0 + 0 + 2 + 10
= 12
c) 5 - ( 14 + 4 - 52 ) - ( 52 - 14 ) + 4
= 5 - 14 - 4 + 52 - 52 + 14 + 4
= 5 - ( 14 + 14 ) + ( 52 - 52 ) + ( -14 + 14 )
= 5 - 14 - 14 + 0 + 0
= 5 - ( 14 - 14 )
= 5 - 0
= 5
\(\text{35 + (–47) – |–12|}\)
\(=-12-12\)
\(=-24\)
\(\text{(–15) – 70 : (–14) + (–32) . (–2)}\)
\(=-15+5+64\)
\(=-10+64\)
\(=54\)
\(\text{ 15 – 12 . (-3)^2 – 135 : |–15|}\)
\(=15-12.9-135:15\)
\(=15-108-9\)
\(=-102\)
Tính hợp lý:
\(\text{ –24 . 78 + 24(–35) – 24(–13)}\)
\(=24.\left(-78+\left(-35\right)-\left(-13\right)\right)\)
\(=24.\left(-100\right)\)
\(=-2400\)
học tốt
35 - {12-[(-14) + (-2)]}
= 35 - 12 + (-14) + (-2)
= 35 - (-14) + 12 - (-2)
= 35 - (-14) + 14
= 35 - 0
= 35
35- {12 - [(-14)+(-2)] }
=35 - [12-(-14-2)]
=35-[12-16]
=35-(-4)
=35+4
=39
a: \(=\dfrac{-36}{35}\cdot\dfrac{14}{9}\cdot\dfrac{-1}{8}=\dfrac{36}{9}\cdot\dfrac{14}{35}\cdot\dfrac{1}{8}=4\cdot\dfrac{1}{8}\cdot\dfrac{2}{5}=\dfrac{1}{5}\)
b: \(=\left(6+\dfrac{1}{8}-\dfrac{1}{2}\right)\cdot4\)
\(=\dfrac{48+1-4}{8}\cdot4=\dfrac{45}{2}\)
Giải:
a) \(-\dfrac{36}{35}:\dfrac{9}{14}.\left(-\dfrac{1}{2}\right)^3\)
\(=-\dfrac{36}{35}.\dfrac{14}{9}.\left(-\dfrac{1}{8}\right)\)
\(=-\dfrac{36.14.\left(-1\right)}{35.9.8}\)
\(=-\dfrac{9.4.2.7.\left(-1\right)}{5.7.9.2.4}\)
\(=-\dfrac{-1}{5}\)
Vậy ...
b) \(\left[6+\left(\dfrac{1}{2}\right)^3-\dfrac{1}{2}\right]:\dfrac{3}{12}\)
\(=\left[6+\dfrac{1}{8}-\dfrac{1}{2}\right].\dfrac{12}{3}\)
\(=\left[\dfrac{48}{8}+\dfrac{1}{8}-\dfrac{4}{8}\right].4\)
\(=\dfrac{48+1-4}{8}.4\)
\(=\dfrac{45}{8}.4\)
\(=\dfrac{45}{2}\)
Vậy ...
\(-\frac{12}{35}\div\frac{7}{11}-\frac{23}{35}\div\frac{7}{11}-\frac{5}{11}\)
\(=\left(-\frac{12}{35}-\frac{23}{35}\right)\div\frac{7}{11}-\frac{5}{11}\)
\(=-1\div\frac{7}{11}-\frac{5}{11}\)
\(=-\frac{11}{7}-\frac{5}{11}\)
\(=-\frac{156}{77}\)
=35-[12-(-16)]
=35-(12+16)
=35-28
=7
~~~HT~~~
= 35 - { 12 - (-16) }
= 35 - 28
= 7
HT