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X x 1,25 + 5,61 = 6,485
x.1,25=6,485-5,61
x.1,25=0,875
x=0,875:1,25
x=0,7
X x 1,25 = 6,485 - 5,61 15,91 : X = 56,54 : 17,8
X x 1,25 = 0,875 15,91 : X = 3,176
X = 0,875 : 1,25 X = 15,91 : 3, 176
X = 0,7 X = 5,009
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\(15,91:x\cdot17,8=76,54\)
\(\Rightarrow15,91:x=76,54:17,8\)
\(\Rightarrow15,91:x=4,3\)
\(\Rightarrow x=15,91:4,3=3,7\)
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17,8 x X = 360,05 - 93,05
17,8 x X = 267
X = 267 : 17,8
X = 15
29,5 x ( X + 10,25 ) = 376,125
X + 10,25 = 376,125 : 29,5
X + 10,25 = 12,75
X = 12,75 - 10,25
X = 2,5
748 : ( X - 31,72 ) = 13,6
X - 31,72 = 748 : 13,6
X - 31,72 = 55
X = 55 + 31,72
X = 86 , 72
207 : 31,6 = 6,55063291139
17,8 . x = 360,05 - 93,05
17,8 . x = 267
x = 267 : 17,8
x = 15
29,5 . (x + 10,25) = 376,125
(x + 10,25) = 376,125 : 29,5
x + 10,25 = 12,75
x = 12,75 - 10,25
x = 2,5
748 : (x - 31,72) = 13,6
(x - 31,72) = 748 : 13,6
x - 31,72 = 55
x = 55 + 31,72
x = 86,72
207 : 31,6 = 6,55063291139
Học tốt!!!
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ta có : 2,6 x X > 7
x = 7/2,6
x > 2,69 mà x là số bé nhất trong các số 2,3,4,5
nên x=3
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[44- (56-x) ] . 12 = 384
<=> (44-56+x) . 12 = 384
<=> (-12 + x) . 12 = 384
<=> 12x - 144 = 384
<=> 12x = 384 + 144
<=> 12x = 528
<=> x = 528 : 12
<=> x = 44
Vậy x = 44
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=1/2x2/3x/3/4/.................x2003/2004
= 1x2x3x................x2003
___________________
2x3x4x................x 2004
=1/2004
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20,13 x 90 + 20 +10,065 x18 + 0,13
= 20,13 x90 + (20 + 0,13 ) + 10,065 x18
= 20,13 x90 + 20,13 x1 + 10,065 x18
= 20,13 x( 90 +1 ) + 10,065 x18
= 20,13x91 + 10, 065 x18
= 20,13 x 91+ (10,065 x2) x9
=20,13 x91 + 20,13 x9
= 20,13 x( 91 + 9)
= 20,13 x 100 = 2013 .
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1,45 x 0,36 + 3,6 x 0,9 - 0,36 x 0,45
= 1,45 x 0,36 + 0,36 x 9 - 0,36 x 0,45
= 0,36 x ( 1,45 + 9 - 0,45)
= 0,36 x { (1,45-0,45) + 9}
= 0,36 x { 1 + 9}
= 0,36 x 10
= 3,6
a) \(X.1,25+5,61=6,48\)
\(x.1,25=6,48+5,61\)
\(x.1,25=12,09\)
\(x=12,09:1,25\)
\(x=9,672\)
b) \(x:15,91.17,8=76,362\)
\(x:15,91=76,362:17,8\)
\(x:15,91=4,29\)
\(x=4,29.15,91\)
\(x=65,2509\)
Dấu chấm là dấu nhân
a, X x 1,25 + 5,61 = 6,48
X x 1,25 = 6,48 - 5,61
X x 1,25 = 0,87
X = 0,87 : 1,25
X = 0,696
b, X : 15,91 x 17,8 = 76,362
X : 15,91 = 76,362 : 17,8
X : 15,91 = 4,29
X = 4,29 x 15,91
X = 68,2539