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a) x - 57 = 63
x = 63 + 57
x = 120
b)119 - x = 97
x = 119 -97
x = 22
c) 7.x : 28 = 5
7.x = 28x5
7.x = 140
x= 140 : 7
x= 20
d) 1751: x = 103
x = 1751 : 103
x = 17
\(\frac{1}{3}+\frac{13}{15}+\frac{33}{35}+\frac{61}{63}+\frac{97}{99}+\frac{141}{143}\)
\(=\left(1-\frac{2}{3}\right)+\left(1-\frac{2}{15}\right)+\left(1-\frac{2}{35}\right)+\left(1-\frac{2}{63}\right)+\left(1-\frac{2}{99}\right)+\left(1-\frac{2}{143}\right)\)
\(=\left(1+1+1+1+1+1\right)-\left(\frac{2}{3}+\frac{2}{15}+\frac{2}{35}+\frac{2}{63}+\frac{2}{99}+\frac{2}{143}\right)\)
\(=6-\left(\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}+\frac{2}{11.13}\right)\)
\(=6-\left(1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}+\frac{1}{11}-\frac{1}{13}\right)\)
\(=6-\left(1-\frac{1}{13}\right)\)
\(=6-\frac{12}{13}\)
\(=\frac{66}{13}\)
Ủng hộ mk nha ^_-
a) - ( -24 + 63 + 71 ) - ( 14 - 73 - 81 ) = 24 - 63 - 71 - 14 + 73 + 81 = 30
b) ( 25 + 38 + 12 ) + ( 2022 - 63 - 12 ) = 25 + 38 + 12 + 2022 - 63 - 12 = 2022
c) ( 97 + 43 - 15 ) - ( 87 + 33 - 25 ) = 97 + 43 - 15 - 87 - 33 + 25 = 30
d) 50 - ( 47 + 50 - 18 ) + ( 47 - 18 ) = 50 - 47 - 50 + 18 + 47 - 18 = 0
nha !
# Kukad'z Lee'z
Đọc tiếp...
A) \(\frac{17}{120}\) ; \(\frac{11}{72}\) ; \(\frac{7}{28}\)
B) \(\frac{-31}{49}\) ; \(\frac{-62}{97}\) ; \(\frac{-63}{97}\) \(\frac{-93}{140}\)
\(\left(3^{13}.3^{19}\right):3^{12}\)
\(=\left(3^{13+19}\right):3^{12}\)
\(=3^{32}:3^{12}\)
\(=3^{32-12}\)
\(=3^{20}\)
\(\left(11^{102}:11^{97}\right):11^{63}\)
\(=\left(11^{102-97}\right):11^{63}\)
\(=11^5:11^{63}\)
\(=11^{5-63}\)
\(=11^{-85}\)
P/s: ko chắc
a) 3 ^ 6 : 3 ^ 2 + 2 ^ 3 + 2 ^ 2
= 36 - 2 + 23 + 2
= 34 + 25 = 81 + 32
= 113 .
b) ( 2100 - 63 ) : 21
= 2037 : 21
= 97 .
c) 32 x 59 + 41 x 32
= 32 x ( 59 + 41 )
= 32 x 100
= 3200 .
d) 99 - 97 + 95 - 93 + 91 - 89 + ... + 7 - 5 + 3 - 1 ( 50 so = 25 hieu )
= 2 + 2 + 2 + ... + 2 + 2 = 2 x 25
= 50 .
giúp mình nha !
Nguyễn Hải Long