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\(41-\dfrac{72}{19-108:\left[59-2\left(3^2-11\cdot2\right)^2\right]}\)
\(=41-\dfrac{72}{19-108:\left[59-2\left(18-22\right)^2\right]}\)
\(=41-\dfrac{72}{19-108:\left[59-2\cdot16\right]}\)
\(=41-\dfrac{72}{19-108:27}\)
\(=41-\dfrac{72}{19-4}=41-\dfrac{72}{15}\)
=41-4,8
=36,2
\(41-72:\left\{19-108:\left[59-2.\left(3^2-11.2\right)^2\right]\right\}\)
\(=41-72:\left\{19-108:\left[59-2.\left(9-22\right)^2\right]\right\}\)
\(=41-72:\left\{19-108:\left[59-2.\left(-13\right)^2\right]\right\}\)
\(=41-72:\left\{19-108:\left[59-2.169\right]\right\}\)
\(=41-72:\left\{19-108:\left[59-338\right]\right\}\)
\(=41-72:\left\{19-108:-279\right\}\)
\(=41-72:\left\{19-\dfrac{-12}{31}\right\}\)
\(=41-72:\dfrac{601}{31}\)
\(=41-\dfrac{2232}{601}\)
\(=\dfrac{22409}{601}\)
số số hạng là :
( 1000000 - 1 ) : 1 + 1 = 1000000
tổng là :
( 1000000 + 1 ) x 1000000 : 2 = 500000500000
đáp số : 500000500000
a, A= 1/5.6+1/6.7+1/7.8+...+1/24.25
=1/5-1/6+1/6-1/7+1/7-1/8+...+1/24-1/25
=1/5-1/25
=4/25
hok tốt k nha
a: \(A=\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+...+\dfrac{1}{24}-\dfrac{1}{25}\)
\(=\dfrac{1}{5}-\dfrac{1}{25}=\dfrac{4}{25}\)
b: \(B=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{8}-\dfrac{1}{19}+\dfrac{1}{19}-\dfrac{1}{32}+\dfrac{1}{32}-\dfrac{1}{57}+\dfrac{1}{57}-\dfrac{1}{87}\)
\(=\dfrac{2}{15}+\dfrac{1}{8}-\dfrac{1}{87}\)
=859/3480
a,
= 51 - 2022 + 2022
= 51
b, = -2019 - 11 + 2019
= -11
c, = 27 - 52 - 37 + 52
= -10
d, = 19 - 32 + 41 - 19 + 25 - 41
= -7
a) (56 - 27) - (11 + 28 - 16)
= 56 - 27 - 11 - 28 + 16
= (56 + 16) – (27 + 11 + 28)
= 72 – (38 + 28)
= 72 – 66
= 6
b) 28 + (19 - 28) - (32 - 57)
= 28 + 19 – 28 – 32 + 57
= (28 – 28) + (19 + 57) – 32
= 0 + 76 – 32
= 76 - 32
= 44
a) (56 - 27) - (11 + 28 - 16)
= 56 - 27 - 11 - 28 + 16
= 56 – ( 27 + 11 + 28) + 16
= 56 – 66 + 16
= -10 + 16
= 6
b) 28 + (19 - 28) - (32 - 57)
= 28 + 19 – 28 – 32 + 57
= (28 – 28) + 19 - 32 + 57
= 0 + (-13) + 57
= 44
\(A=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{19}+...+\dfrac{1}{57}-\dfrac{1}{87}=\dfrac{1}{3}-\dfrac{1}{87}=\dfrac{28}{87}\)
(19 - 32) - [(-32) - 11]
= 19 - 32 + 32 + 11
= (19 + 11) + (32 - 32)
= 30 + 0
= 30
(19 - 32) - [(-32) - 11]
= (-13) - (-43)
= (-13) + 43
= 30