103 + 2.53 + 53 / 55 (phân số)
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\(62\cdot10:\left\{780:\left[103-\left(2\cdot53+35\cdot14\right)\right]\right\}\)
\(=62\cdot10:\left\{780:\left[103-596\right]\right\}\)
\(=620:\dfrac{-780}{493}\)
\(=620\cdot\dfrac{-493}{780}=\dfrac{-15283}{39}\)
\(a,\left\{\left[\left(37+13\right):5\right]-45:5\right\}.7\)
\(=\left\{\left[50:5\right]-45:5\right\}.7\)
\(=\left\{10-45:5\right\}.7\)
\(=\left\{10-9\right\}.7\)
\(=1.7=7\)
a) 12/37 < 19/54
b) 18/53 > 26/78
c) 13/79 < 34/204
d) 25/103 < 74/295
e) 58/63 < 36/55
g) 456/461 > 123/128
a,số các số hạng là
41-5 :3 + 1 = 13
tổng là
(5 + 41 )x 13 : 2 = 299
b, tổng = -106
\(\dfrac{25}{27};\dfrac{51}{53};\dfrac{47}{49};\dfrac{103}{105};\dfrac{2009}{2011};\dfrac{1963}{1963};\)
a ) 3/5;33/55;333/555
33:11/55:11=3/5 ; 333:111/555:111=3/5
b)101/103;101101/103103
101101:1001/103103:1001=101/103
a, 71.2 – 6.(2x+5) = 10 5 : 10 3
71.2 – 6.(2x+5) = 10 2
6.(2x+5) = 71.2 – 100
6.(2x+5) = 42
x = 1
b, 5 x + 3 4 . 6 8 = 6 9 . 3 4
5 x + 3 4 . 6 8 = 6 8 . 6 . 3 4
5 x + 3 4 = 6 8 . 6 . 3 4 : 6 8 = 6 . 3 4
5x = 6 . 3 4 - 3 4 = 5 . 3 4
x = 3 4
c, 12:{390:[5. 10 2 – ( 5 3 + x . 7 2 )]} = 4
390:[5. 10 2 – ( 5 3 + x . 7 2 )] = 12:4 = 3
5. 10 2 – ( 5 3 + x . 7 2 ) = 390:3 = 130
5 3 + x . 7 2 = 5. 10 2 – 130 = 370
x . 7 2 = 370 – 5 3 = 245
x = 245: 7 2 = 5
d, 5 3 .(3x+2):13 = 10 3 : 13 5 : 13 4
5 3 .(3x+2):13 = 10 3 : 13
3x+2 = 10 3 : 13 : 5 3 .13 = 8
x = 2
a: \(\dfrac{25}{26}=1-\dfrac{1}{26}\)
\(\dfrac{50}{51}=1-\dfrac{1}{51}\)
mà \(-\dfrac{1}{26}< -\dfrac{1}{51}\)
nên \(\dfrac{25}{26}< \dfrac{50}{51}\)
b: \(\dfrac{149}{157}=1-\dfrac{8}{157}\)
\(\dfrac{449}{457}=1-\dfrac{8}{457}\)
mà \(-\dfrac{8}{157}>-\dfrac{8}{457}\)
nên \(\dfrac{149}{157}>\dfrac{449}{457}\)